JP5868800B2 - Evaluation method, evaluation apparatus and evaluation program for concrete property values - Google Patents

Description

  The present invention relates to a concrete property value evaluation method, an evaluation apparatus, and an evaluation program. More specifically, the present invention relates to a technique for calculating an apparent diffusion coefficient of chloride ions of concrete, which is one of physical property values used in, for example, maintenance and management of concrete structures.

  As a conventional method for measuring the apparent diffusion coefficient of chloride ions in concrete in an actual structure, the `` Measurement method of total chloride ion distribution in concrete in an actual structure (draft), which has been standardized by the Japan Society of Civil Engineers, '' (JSCE-G573-2010) "(Non-Patent Document 1). This method uses the following three procedures to analyze the concentration of chlorine on the surface and inside of a concrete structure, and uses the solution of the diffusion equation based on Fick's second law for the concentration distribution in the depth direction. Thus, regression analysis is performed, and the surface chloride ion concentration and the apparent diffusion coefficient of chloride ions are calculated simultaneously.

Procedure (1): Method according to JIS A 1154 using a core sample In accordance with JIS A 1154 Annex 1, the concrete structure is pierced to a predetermined size (for example, a diameter of 100 mm and a length of 100 mm). A cylindrical sample (also referred to as a core sample) is taken out. Then, the sample is sliced to a thickness of 5 to 10 [mm], and each slice is crushed and pulverized so as to pass through a 149 [μm] sieve, and air-dried overnight and then dissolved and filtered with nitric acid. To extract ions of the target compound and immerse a pair or more electrodes in the solution to obtain information on the concentration of the target compound by titration (referred to as potentiometric titration method). Thereby, the concentration of chlorine on the surface and inside is measured and the concentration distribution of chlorine is evaluated.

Procedure (2): Method by surface analysis method (draft) of elements in concrete by JSCE G 574-EPMA method using core sample According to JIS A 1154 Annex 1, the concrete structure is pierced to a predetermined size. A cylindrical sample (also called a core sample) having a diameter (for example, a diameter of 100 [mm] and a length of 100 [mm] or more) is taken out. Then, the surface to be analyzed is polished and flattened from the core sample with a polishing disk or the like. Thereafter, after sufficiently drying in a vacuum dryer, an appropriate conductive material is uniformly coated on the analysis surface of the analysis sample by a vapor deposition apparatus or the like. Thereafter, the surface to be analyzed is irradiated with a wavelength dispersion type electron probe microanalyzer (EPMA: abbreviation of Electron Probe Micro Analyzer), and the concentration distribution of chlorine as the target element is evaluated.

Procedure (3): Method using drill powder Concrete powder is collected with a drill for drilling concrete having a diameter of 20 mm or more with respect to the concrete structure. Next, each powder is crushed and powdered through a 149 [μm] sieve, air-dried overnight, and then dissolved and filtered with nitric acid to extract ions of the target compound and a pair or more. The electrode is immersed in a solution to obtain information on the concentration of the target compound by titration (referred to as potentiometric titration method). Thereby, the concentration of chlorine on the surface and inside is measured and the concentration distribution of chlorine is evaluated.

  There are also examples of research on methods for calculating the apparent diffusion coefficient of chloride ions in concrete (Non-Patent Documents 2 and 3). The apparent diffusion coefficient of chloride ions in concrete is evaluated by the diffusion coefficient, which is a macroscopic physical property value that is easy to handle in terms of design. Since chloride ions exist as negatively charged particles in water, the diffusion coefficient is one of the typical electrical properties of concrete, volume resistivity (electrical resistivity; also called specific resistance). It is thought that the relationship with is deep. For this reason, methods for calculating the apparent diffusion coefficient of chloride ions in concrete from volume resistivity, which can be measured relatively easily, have been studied.

Japan Society of Civil Engineers: Established in 2010 Standard Specification for Concrete [Standard], Maruzen, 2010 Hiroshi Minagawa et al .: Basic research on the relationship between the electrical resistivity of concrete and the apparent diffusion coefficient of chloride ion, JSCE, Vol.66, No.1, pp.119-131, 2010 Yuki Saito et al .: Relationship between electrical resistivity and chloride ion diffusion coefficient of concrete large specimens exposed to the oceanic tidal zone, Annual report of concrete engineering, Vol.33, No.1, pp.785-790, 2011 Year

  However, although the method of analyzing the concentration distribution of chlorine by the potentiometric titration method or the like as in the method of Non-Patent Document 1 is a reliable method, there is a problem that a great amount of labor and cost are required for performing the test. is there. Specifically, it is difficult to perform chemical analysis immediately at the sampling site because it requires processes such as grinding and pulverization, dissolution with nitric acid, and filtration after core sample collection, and the survey results are obtained. There is a problem that a lot of labor and time of several days or more are required.

  In addition, the method using a core sample or drill powder as in the method in Non-Patent Document 1 is a destructive inspection that damages the concrete of an actual structure in order to collect a sample. If the penetrating cylindrical sample is thickened, the strength of the actual structure may be affected. On the other hand, if the sample is made small, there is a problem that the spatial resolution is lowered and the estimation accuracy is deteriorated.

  Further, in the method using the core sample and drill powder as in the method in Non-Patent Document 1, the steel material (that is, the reinforcing bar) inside the actual structure is damaged when the core sample and drill powder are collected from the reinforced concrete actual structure. Therefore, it is not always possible to collect the core sample or drill powder from any part of the concrete structure because the sample cannot be collected from the vicinity of the embedded position of the steel material, that is, There is a problem that it is not always possible to estimate the apparent diffusion coefficient of chloride ions at an arbitrary location of a concrete structure.

  In addition, the methods proposed in Non-Patent Documents 2 and 3 do not consider important physicochemical characteristics (specifically, capacitance characteristics and charging characteristics in pores) related to concrete, and Because the interaction between concrete and chloride ions (specifically, adsorption, immobilization, etc.) is not taken into account, the diffusion coefficient tends to be overestimated compared to the measured value. It is hard to say that the estimation accuracy is practical.

  In the methods proposed in Non-Patent Documents 2 and 3, the composition (specifically, type and concentration) of ions dissolved in the liquid water inside the concrete is part of the input conditions. However, it is difficult to say that a standard measurement method of such an ion composition has been established. At present, it is almost impossible to set this input condition. Therefore, it has been proposed in Non-Patent Documents 2 and 3. However, it is hard to say that this method is practically possible as a non-destructive inspection method.

  In addition, the various evaluation formulas presented so far have poor estimation accuracy, and the laboratory test method requires several months or more to obtain results even if it is an accelerated test. Although exposure tests are highly reproducible, there are problems in that they require more than a few years and are expensive.

  Therefore, the present invention can be applied according to input conditions that can be set practically, has good estimation accuracy, and further does not damage the structure and the chloride of the concrete at any place of the structure An object of the present invention is to provide an evaluation method, an evaluation apparatus, and an evaluation program for a concrete property value capable of estimating an effective diffusion coefficient of ions. In addition, the present invention provides a method for evaluating a physical property value of concrete, an evaluation device, and a method capable of estimating an effective diffusion coefficient of chloride ions of concrete that can be simply and inexpensively performed in a short time and has good estimation accuracy. The purpose is to provide an evaluation program.

  The present inventor derived the following three empirical formulas while studying a method for evaluating an effective diffusion coefficient of chloride ions as a physical property value of concrete.

ここに、 ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
β：実験定数
をそれぞれ表す。 1) Relational expression between moisture content and volume resistivity Specifically, the function form shown in Formula 1 is used.

Where w _s : moisture content of concrete in fully saturated state [%],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
β: Experimental constant
Respectively.

ここに、 Ｄ_e：完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数
〔cm²／年〕，
ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ε，γ：実験定数
をそれぞれ表す。 2) Relational expression between volume resistivity in fully saturated state and effective diffusion coefficient of chloride ion Specifically, for example, it is conceivable to use a function form shown in Expression 2.

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm ² / year],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
ε, γ: experimental constant
Respectively.

3) Relational expression between moisture content and water binder ratio in fully saturated state The relational expression between moisture content and volume resistivity shown as Equation 1 is a factor representing the quality of concrete, for example, water binder The ratio is not included as an explanatory variable. In addition, the relational expression between the volume resistivity and the effective diffusion coefficient of chloride ion expressed as Equation 2 is a case of a fully saturated state (that is, a state where all the voids inside the concrete are filled with water). In order to relate 1 to Equation 2, a relational expression between the moisture content of concrete in a fully saturated state and the water binder ratio representing the quality of the concrete is necessary.

ここに、 ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
Ｗ／Ｂ：コンクリートの水結合材比〔％〕，
ζ，κ：実験定数
をそれぞれ表す。 Specifically, for example, it is conceivable to use the function form shown in Equation 3. The experimental constants ζ and κ are generally distinguished depending on the type of cement.

Where w _s : moisture content of concrete in fully saturated state [%],
W / B: Concrete water binder ratio [%],
ζ, κ: experimental constant
Respectively.

ここに、 Ｄ_e：完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数
〔cm²／年〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
Ｗ／Ｂ：コンクリートの水結合材比〔％〕，
β：完全飽和状態におけるコンクリートの含水率と体積抵抗率との間の関
係式に関する実験定数，
ε，γ：完全飽和状態におけるコンクリートの体積抵抗率と塩化物イオン
の実効拡散係数との間の関係式に関する実験定数，
ζ，κ：完全飽和状態でのコンクリートの含水率とコンクリートの水
結合材比との間の関係式に関する実験定数
をそれぞれ表す。 Substituting Equations 1 and 3 into Equation 2 yields Equation 4. Note that the experimental constants ζ and κ are generally distinguished by the type of cement as described above.

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm ² / year],
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
W / B: Concrete water binder ratio [%],
β: Relationship between moisture content and volume resistivity of concrete in fully saturated state
Experimental constant for the equation,
ε, γ: Volume resistivity and chloride ion of concrete in fully saturated state
An experimental constant for the relation between the effective diffusion coefficient of
ζ, κ: Concrete moisture content and concrete water in fully saturated state
Experimental constants on the relation between the binder ratio
Respectively.

Then, it reproducibility is high estimation accuracy of the values obtained by actual measurement value of the effective diffusion coefficient D _e of the chloride ions of the concrete which is calculated by the formula 4 is good has been confirmed by the present inventors.

ここに、 ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
α，β：実験定数
をそれぞれ表す
を用いて完全飽和状態におけるコンクリートの含水率ｗ_sと体積抵抗率ρ_sとの間の関係の定式化を行ってべき乗の係数βを推算するステップと、完全飽和状態におけるコンクリートの体積抵抗率と塩化物イオンの実効拡散係数との間の関係の定式化を行って関係式を推算するステップと、完全飽和状態でのコンクリートの含水率とコンクリートの水結合材比との間の関係の定式化を行って関係式を推算するステップと、評価対象のコンクリートに対して含水率の計測及び体積抵抗率の計測を行って含水率の計測値と体積抵抗率の計測値との組み合わせデータを取得するステップと、両対数軸上において含水率の計測値と体積抵抗率の計測値との組み合わせデータからべき乗の係数βを変化の勾配として、評価対象のコンクリートについて予め計算された水結合材比を前記含水率と水結合材比との間の関係式に代入して算出された含水率の自然対数値に対応する体積抵抗率の自然対数値を算出して完全飽和状態における体積抵抗率を推算するステップと、当該推算された完全飽和状態における体積抵抗率を前記体積抵抗率と塩化物イオンの実効拡散係数との間の関係式に代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定するステップとを有するようにしている。 The method for evaluating a physical property value of claim 1 is based on the above-mentioned new knowledge unique to the inventor, and the following formula 5

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Formulating the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state using respectively representing the power coefficient β, and the concrete volume in the fully saturated state Formulating the relationship between resistivity and effective diffusion coefficient of chloride ions to estimate the relationship, and the relationship between concrete moisture content and concrete water binder ratio in fully saturated state Data of combination of the measured value of the moisture content and the measured value of the volume resistivity by measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated And using the combined data of the measured value of moisture content and the measured value of volume resistivity on the logarithmic axis, the coefficient of power β is the gradient of change, and the concrete to be evaluated The natural logarithm of volume resistivity corresponding to the natural logarithm of the moisture content calculated by substituting the water binder ratio calculated in advance for the relation between the moisture content and the water binder ratio is calculated. a step of estimating the volume resistivity at full saturation Te, the estimated been fully volume resistivity at saturation of the said volume resistivity assignment to fully saturated relationship between the effective diffusion coefficient of chloride ions Estimating the effective diffusion coefficient of concrete chloride ions in the state .

ここに、 ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
α，β：実験定数
をそれぞれ表す
を用いて完全飽和状態におけるコンクリートの含水率ｗ_sと体積抵抗率ρ_sとの間の関係の定式化を行って推算されたべき乗の係数βを変化の勾配として、完全飽和状態でのコンクリートの含水率とコンクリートの水結合材比との間の関係の定式化を行って推算された関係式に評価対象のコンクリートについて予め計算された水結合材比の値を代入して算出された含水率の自然対数値に対応する体積抵抗率の自然対数値を算出して完全飽和状態における体積抵抗率を推算する手段と、完全飽和状態におけるコンクリートの体積抵抗率と塩化物イオンの実効拡散係数との間の関係の定式化を行って推算された関係式に前記推算された完全飽和状態における体積抵抗率を代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定する手段とを有するにしている。 The apparatus for evaluating a physical property value of concrete according to claim 4 includes: a measured value of the moisture content and a measured value of the volume resistivity obtained by measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated. Means for reading the combination data and the value of the water binder ratio calculated in advance for the concrete to be evaluated from the internal storage device or the external storage device, and the measured value of the moisture content and the measured value of the volume resistivity on the logarithmic axis. From the combination data, the following formula 6

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Is used to formulate the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state, and the power coefficient β estimated as the gradient of change in the fully saturated state Calculated by substituting the value of the water binder ratio calculated in advance for the concrete to be evaluated into the relational expression estimated by formulating the relationship between the moisture content of the concrete and the water binder ratio of the concrete. Means for calculating the volume resistivity in the fully saturated state by calculating the natural logarithm of the volume resistivity corresponding to the natural logarithm of the moisture content, and the effective diffusion of the volume resistivity and chloride ions of the concrete in the fully saturated state of chloride ions of the concrete in a completely saturated state by substituting the volume resistivity at the estimated been fully saturated state estimated by the equation performed formulate relationships between coefficients It is to have a means for estimating the effective diffusion coefficient.

ここに、 ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
α，β：実験定数
をそれぞれ表す
を用いて完全飽和状態におけるコンクリートの含水率ｗ_sと体積抵抗率ρ_sとの間の関係の定式化を行って推算されたべき乗の係数βを変化の勾配として、完全飽和状態でのコンクリートの含水率とコンクリートの水結合材比との間の関係の定式化を行って推算された関係式に評価対象のコンクリートについて予め計算された水結合材比の値を代入して算出された含水率の自然対数値に対応する体積抵抗率の自然対数値を算出して体積抵抗率を推算する手段、完全飽和状態におけるコンクリートの体積抵抗率と塩化物イオンの実効拡散係数との間の関係の定式化を行って推算された関係式に前記推算された体積抵抗率を代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定する手段としてコンピュータを機能させるようにしている。 The concrete physical property value evaluation program according to claim 7 includes: a measured value of the moisture content and a measured value of the volume resistivity obtained by measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated. Means for reading the combination data and the value of the water binder ratio calculated in advance for the concrete to be evaluated from the internal storage device or the external storage device, the combination of the measured value of the moisture content and the measured value of the volume resistivity on the logarithmic axis From the data, the following formula 7

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Is used to formulate the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state, and the power coefficient β estimated as the gradient of change in the fully saturated state Calculated by substituting the value of the water binder ratio calculated in advance for the concrete to be evaluated into the relational expression estimated by formulating the relationship between the moisture content of the concrete and the water binder ratio of the concrete. A means for calculating the volume resistivity by calculating the natural logarithm of the volume resistivity corresponding to the natural logarithm of the moisture content, between the volume resistivity of concrete and the effective diffusion coefficient of chloride ions in the fully saturated state computer as a means for estimating the effective diffusion coefficient of chloride ions in the concrete in a completely saturated state by substituting the estimated volumetric resistivity was estimated by performing the formulation of the relationship equation So that to function.

  Therefore, according to the evaluation method, evaluation apparatus and evaluation program for these physical property values of concrete, experimental constants and experimental formulas obtained in advance by estimation using data that can be actually measured or collected and the concrete to be evaluated ( Since the effective diffusion coefficient of chloride ions is estimated using the moisture content and volume resistivity measured in the actual structure) and the pre-calculated concrete water binder ratio, it can be set realistically. The effective diffusion coefficient of chloride ions is estimated only by the input conditions, and any damage of the actual structure is not affected without damaging the actual structure and thus without being affected by the arrangement of steel materials inside the actual structure. The effective diffusion coefficient of chloride ion at the location is estimated.

  Further, when the data used for the estimation of the experimental constant and the empirical formula are collected by examining existing literatures, the effective diffusion coefficient of chloride ions can be estimated simply and inexpensively in a short time.

ここに、 ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
α，β：実験定数
をそれぞれ表す
を用いて完全飽和状態におけるコンクリートの含水率ｗ_sと体積抵抗率ρ_sとの間の関係の定式化を行ってべき乗の係数βを推算するステップと、完全飽和状態におけるコンクリートの体積抵抗率ρ_sと塩化物イオンの実効拡散係数との間の関係の定式化を行って関係式を推算するステップと、完全飽和状態でのコンクリートの含水率ｗ_sとコンクリートの水結合材比との間の関係の定式化を行って関係式を推算するステップと、評価対象のコンクリートに対して含水率の計測及び体積抵抗率の計測を行って含水率の計測値ｗ₁及び体積抵抗率の計測値ρ₁を取得するステップと、前記完全飽和状態における体積抵抗率ρ_sと塩化物イオンの実効拡散係数との間の関係式中の体積抵抗率ρ_sに含水率ｗ_sと体積抵抗率ρ_sとの間の関係式である以下の数式９

ここに、 ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
β：実験定数
をそれぞれ表す
を代入すると共に代入後の式中の含水率ｗ_sに前記含水率ｗ_sと水結合材比との間の関係式を代入して得られた式に、評価対象のコンクリートの含水率の計測値ｗ₁及び体積抵抗率の計測値ρ₁並びに評価対象のコンクリートについて予め計算された水結合材比の値を代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定するステップとを有するようにしている。 Moreover, the evaluation method of the concrete property value of Claim 2 is the following numerical formula 8.

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Formulating the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state using respectively representing the power coefficient β, and the concrete volume in the fully saturated state Formulating the relationship between the resistivity ρ _s and the effective diffusion coefficient of chloride ions to estimate the relationship, the moisture content w _s of concrete in the fully saturated state and the water binder ratio of the concrete Formulating the relation between the two, estimating the relation, and measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated to determine the measured moisture content w ₁ and the volume resistivity. obtaining a measured value [rho _1, the full volume resistivity at saturation [rho _s and moisture content w _s and the volume resistivity volume resistivity [rho _s in relation between the effective diffusion coefficient of chloride ions The relation between ρ _s The following formula 9

Where w _s : moisture content of concrete in fully saturated state [%],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
β: Experimental constant
To be equation obtained by substituting the relationship between the water content w _s and water binder ratio water content w _s in the formula and assignment while substituting each represent, water-containing concrete to be evaluated The effective diffusion coefficient of chloride ions in concrete in the fully saturated state is estimated by substituting the measured value w ₁ of the rate, the measured value ρ ₁ of the volume resistivity, and the value of the water binder ratio calculated in advance for the concrete to be evaluated. And a step of performing.

ここに、 ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
α，β：実験定数
をそれぞれ表す
を用いて完全飽和状態におけるコンクリートの含水率ｗ_sと体積抵抗率ρ_sとの間の関係の定式化を行ってべき乗の係数βを推算し、また、完全飽和状態におけるコンクリートの体積抵抗率ρ_sと塩化物イオンの実効拡散係数との間の関係の定式化を行って関係式を推算すると共に完全飽和状態でのコンクリートの含水率ｗ_sとコンクリートの水結合材比との間の関係の定式化を行って関係式を推算し、そして、前記体積抵抗率ρ_sと塩化物イオンの実効拡散係数との間の関係式中の体積抵抗率ρ_sに含水率ｗ_sと体積抵抗率ρ_sとの間の関係式である以下の数式１１

ここに、 ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
β：実験定数
をそれぞれ表す
を代入すると共に代入後の式中の含水率ｗ_sに前記含水率ｗ_sと水結合材比との間の関係式を代入して得られた式に、評価対象のコンクリートの含水率の計測値ｗ₁及び体積抵抗率の計測値ρ₁並びに評価対象のコンクリートについて予め計算された水結合材比の値を代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定する手段とを有するようにしている。 The apparatus for evaluating a physical property value of concrete according to claim 5 is a measured value of moisture content w ₁ and a measured value of volume resistivity obtained by measuring moisture content and measuring volume resistivity of the concrete to be evaluated. means for reading the combination data with ρ ₁ and the value of the water binder ratio calculated in advance for the concrete to be evaluated from the internal storage device or the external storage device;

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Is used to formulate the relationship between the moisture content w _s of concrete in the fully saturated state and the volume resistivity ρ _s to estimate the power coefficient β, and the volume of the concrete in the fully saturated state Formulate the relationship between the resistivity ρ _s and the effective diffusion coefficient of chloride ions to estimate the relationship, and between the concrete moisture content w _s and the concrete water binder ratio in fully saturated state by doing formulate estimate equation relationship, and a water content w _s and the volume to the volume resistivity [rho _s in relation between the volume resistivity [rho _s the effective diffusion coefficient of chloride ions The following formula 11 is a relational expression between the resistivity ρ _s and

Where w _s : moisture content of concrete in fully saturated state [%],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
β: Experimental constant
To be equation obtained by substituting the relationship between the water content w _s and water binder ratio water content w _s in the formula and assignment while substituting each represent, water-containing concrete to be evaluated The effective diffusion coefficient of chloride ions in concrete in the fully saturated state is estimated by substituting the measured value w ₁ of the rate, the measured value ρ ₁ of the volume resistivity, and the value of the water binder ratio calculated in advance for the concrete to be evaluated. Means to do.

ここに、 ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
α，β：実験定数
をそれぞれ表す
を用いて完全飽和状態におけるコンクリートの含水率ｗ_sと体積抵抗率ρ_sとの間の関係の定式化を行ってべき乗の係数βを推算し、また、完全飽和状態におけるコンクリートの体積抵抗率ρ_sと塩化物イオンの実効拡散係数との間の関係の定式化を行って関係式を推算すると共に完全飽和状態でのコンクリートの含水率ｗ_sとコンクリートの水結合材比との間の関係の定式化を行って関係式を推算し、そして、前記体積抵抗率ρ_sと塩化物イオンの実効拡散係数との間の関係式中の体積抵抗率ρ_sに含水率ｗ_sと体積抵抗率ρ_sとの間の関係式である以下の数式１３

ここに、 ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
β：実験定数
をそれぞれ表す
を代入すると共に代入後の式中の含水率ｗ_sに前記含水率ｗ_sと水結合材比との間の関係式を代入して得られた式に、評価対象のコンクリートの含水率の計測値ｗ₁及び体積抵抗率の計測値ρ₁並びに評価対象のコンクリートについて予め計算された水結合材比の値を代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定する手段としてコンピュータを機能させるようにしている。 The concrete physical property value evaluation program according to claim 8 is a moisture content measurement value w ₁ and a volume resistivity measurement value obtained by measuring moisture content and measuring volume resistivity of the concrete to be evaluated. means for reading the combination data with ρ ₁ and the value of the water binder ratio calculated in advance for the concrete to be evaluated from the internal storage device or the external storage device;

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Is used to formulate the relationship between the moisture content w _s of concrete in the fully saturated state and the volume resistivity ρ _s to estimate the power coefficient β, and the volume of the concrete in the fully saturated state Formulate the relationship between the resistivity ρ _s and the effective diffusion coefficient of chloride ions to estimate the relationship, and between the concrete moisture content w _s and the concrete water binder ratio in fully saturated state by doing formulate estimate equation relationship, and a water content w _s and the volume to the volume resistivity [rho _s in relation between the volume resistivity [rho _s the effective diffusion coefficient of chloride ions The following formula 13 which is a relational expression between the resistivity ρ _s and

Where w _s : moisture content of concrete in fully saturated state [%],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
β: Experimental constant
To be equation obtained by substituting the relationship between the water content w _s and water binder ratio water content w _s in the formula and assignment while substituting each represent, water-containing concrete to be evaluated The effective diffusion coefficient of chloride ions in concrete in the fully saturated state is estimated by substituting the measured value w ₁ of the rate, the measured value ρ ₁ of the volume resistivity, and the value of the water binder ratio calculated in advance for the concrete to be evaluated. The computer is made to function as a means to do this.

  Therefore, according to the evaluation method, evaluation apparatus and evaluation program for these physical property values of concrete, experimental constants and experimental formulas obtained in advance by estimation using data that can be actually measured or collected and the concrete to be evaluated ( Since the effective diffusion coefficient of chloride ions is estimated using the moisture content and volume resistivity measured in the actual structure) and the water binder ratio calculated in advance, it can be set realistically. The effective diffusion coefficient of chloride ions is estimated only by the input conditions, and without damaging the actual structure, and therefore without being affected by the arrangement of steel materials inside the actual structure, at any point in the actual structure. The effective diffusion coefficient of chloride ions is estimated.

  Further, when the data used for the estimation of the experimental constant and the empirical formula are collected by examining existing literatures, the effective diffusion coefficient of chloride ions can be estimated simply and inexpensively in a short time.

ここに、 Ｄ_e：完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数
〔cm2／年〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
Ｗ／Ｂ：コンクリートの水結合材比〔％〕，
β，ε，γ，ζ，κ：係数（表１に示す値を用いる）
をそれぞれ表す
に評価対象のコンクリートの含水率の計測値ｗ₁及び体積抵抗率の計測値ρ₁並びに評価対象のコンクリートについての水結合材比を代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定するステップとを有するようにしている。 The method for evaluating a physical property value of a concrete according to claim 3 includes a step of calculating a water binder ratio for the concrete to be evaluated, and a moisture content measurement and a volume resistivity measurement for the evaluation concrete. Step of obtaining the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity, and the following formula 14

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm2 / year],
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
W / B: Concrete water binder ratio [%],
β, ε, γ, ζ, κ: coefficients (values shown in Table 1 are used)
The representative evaluation of the subject of the concrete measured value of the water content w ₁ and the volume resistivity of the measured values [rho ₁ and evaluated for concrete by substituting water binder ratio of the concrete in full saturation of chloride ions, respectively Estimating an effective diffusion coefficient.

ここに、 Ｄ_e：完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数
〔cm2／年〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
Ｗ／Ｂ：コンクリートの水結合材比〔％〕，
β，ε，γ，ζ，κ：係数（表１に示す値を用いる）
をそれぞれ表す
に評価対象のコンクリートについて予め計算された含水率の計測値ｗ₁及び体積抵抗率の計測値ρ₁並びに評価対象のコンクリートの水結合材比を代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定する手段とを有するようにしている。 The concrete physical property value evaluation apparatus according to claim 6 is a moisture content measurement value w ₁ and a volume resistivity measurement value obtained by measuring moisture content and measuring volume resistivity of the concrete to be evaluated. means for reading the combination data with ρ ₁ and the value of the water binder ratio calculated in advance for the concrete to be evaluated from the internal storage device or the external storage device;

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm2 / year],
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
W / B: Concrete water binder ratio [%],
β, ε, γ, ζ, κ: coefficients (values shown in Table 1 are used)
Is used to substitute the measured water content w ₁ and the measured volume resistivity ρ ₁ of the concrete to be evaluated, and the water binder ratio of the concrete to be evaluated , and the chlorination of the concrete in a fully saturated state. Means for estimating the effective diffusion coefficient of the product ions.

ここに、 Ｄ_e：完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数
〔cm2／年〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
Ｗ／Ｂ：コンクリートの水結合材比〔％〕，
β，ε，γ，ζ，κ：係数（表１に示す値を用いる）
をそれぞれ表す
に評価対象のコンクリートの含水率の計測値ｗ₁及び体積抵抗率の計測値ρ₁並びに評価対象のコンクリートについて予め計算された水結合材比を代入して完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数を推定する手段としてコンピュータを機能させるようにしている。 Evaluation program Concrete physical properties of claim 9, wherein the measured values of moisture content measurement and volume resistivity measuring the obtained moisture content performed in w ₁ and the volume resistivity of the measured values for the concrete to be evaluated Means for reading the combination data with ρ ₁ and the value of the water binder ratio calculated in advance for the concrete to be evaluated from the internal storage device or the external storage device,

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm2 / year],
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
W / B: Concrete water binder ratio [%],
β, ε, γ, ζ, κ: coefficients (values shown in Table 1 are used)
Chloride Concrete Evaluation concrete completely saturated by substituting the previously calculated water binding agent ratio for the measured value [rho ₁ and the evaluated measurement values w ₁ and the volume resistivity of the water content of the concrete object to represent each The computer is made to function as a means for estimating the effective diffusion coefficient of product ions.

  Therefore, according to the evaluation method, evaluation apparatus, and evaluation program for these physical property values of the concrete, the moisture content and volume resistivity measured in advance for the predetermined estimation formula and the concrete (actual structure) to be evaluated were calculated in advance. Since the effective diffusion coefficient of chloride ions is estimated using the water binder ratio, the effective diffusion coefficient of chloride ions is estimated only by the input conditions that can be set practically, and the actual structure The effective diffusion coefficient of chloride ions at any location of the actual structure is estimated without damaging the object and therefore without being affected by the arrangement of the steel materials inside the actual structure. Furthermore, the effective diffusion coefficient of chloride ions can be estimated simply and inexpensively in a short time.

  According to the evaluation method, the evaluation apparatus, and the evaluation program for the concrete property values of the present invention, it is possible to estimate the effective diffusion coefficient of chloride ions only with input conditions that can be set practically, and damage the actual structure. Since it is possible to estimate the effective diffusion coefficient of chloride ions at any location of the actual structure without giving it, the practicality is high and the versatility can be improved. In addition, since the effective diffusion coefficient of chloride ions can be estimated with good accuracy, it is possible to improve the practicality and reliability as an estimation technique for the effective diffusion coefficient of chloride ions.

  Furthermore, according to the evaluation method, evaluation apparatus and evaluation program for the physical property values of the present invention, it is possible to estimate the effective diffusion coefficient of chloride ions with good accuracy in a simple and inexpensive manner in a short time. From this point, practicality is high and versatility can be improved.

It is a flowchart explaining an example of 1st embodiment of the evaluation method of the concrete physical property value of this invention. It is a functional block diagram of the evaluation apparatus of the concrete property value implement | achieved by the said program in the case of implementing the evaluation method of the concrete property value of 1st embodiment using the evaluation program of a concrete property value. It is a figure explaining the view which estimates the volume resistivity at the time of saturation from the measurement result of a moisture content and a volume resistivity. It is a flowchart explaining an example of 2nd embodiment of the evaluation method of the concrete physical property value of this invention. It is a functional block diagram of the evaluation apparatus of the concrete property value implement | achieved by the said program in the case of implementing the evaluation method of the concrete property value of 2nd embodiment and 3rd embodiment using the evaluation program of a concrete property value. . It is a figure which shows the comparison result of the estimated value and effective value of the effective diffusion coefficient of a chloride ion in Example 1 regarding the method corresponding to 3rd embodiment about the type of binder about a normal cement type | system | group. (A) is a figure which shows the comparison result about no salt in the pore solution inside concrete. (B) is a figure which shows the comparison result about presence of salt in the pore solution inside concrete. It is a figure which shows the comparison result of the estimated value and effective value of the effective diffusion coefficient of a chloride ion in Example 1 regarding the method corresponding to 3rd embodiment about the mixed cement type | mold. (A) is a figure which shows the comparison result about no salt in the pore solution inside concrete. (B) is a figure which shows the comparison result about presence of salt in the pore solution inside concrete.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  FIG. 1 to FIG. 3 show an example of the first embodiment of the evaluation method, evaluation apparatus, and evaluation program for concrete property values according to the present invention.

The concrete physical property value evaluation method of the present invention corresponding to the first embodiment is based on the relationship between the moisture content w _s and the volume resistivity ρ _s of concrete in a fully saturated state using Equation 17 (described later). A step of formulating and estimating a power factor β, a step of formulating a relationship between the volume resistivity of concrete in a fully saturated state and the effective diffusion coefficient of chloride ions, and Formulating the relationship between the moisture content of concrete in the fully saturated state and the water binder ratio representing the quality of the concrete to estimate the relationship, and the moisture content of the concrete to be evaluated Measuring the volume resistivity and measuring the moisture content and obtaining the combined data of the measured volume resistivity and the measured volume resistivity; and the measured moisture content and the measured volume resistivity on the logarithmic axis; Moisture content calculated by substituting the water binder ratio calculated in advance for the concrete to be evaluated into the relational expression between the moisture content and the water binder ratio, using the power factor β as the gradient of change from the combination data of Calculating a natural logarithm of the volume resistivity corresponding to the natural logarithm of the rate and estimating the volume resistivity; and calculating the calculated volume resistivity between the volume resistivity and the effective diffusion coefficient of chloride ions. And substituting in the relational expression between them to estimate the effective diffusion coefficient of chloride ions.

Moreover, the concrete physical property value evaluation apparatus of the present invention corresponding to the first embodiment includes a measured value of moisture content obtained by measuring moisture content and measuring volume resistivity of the concrete to be evaluated. Means for reading the combined data with the measured value of the volume resistivity and the value of the water binder ratio calculated in advance for the concrete to be evaluated from the internal storage device or the external storage device, and the measured value of the moisture content on the logarithmic axis Estimated from the combined data with the measured volume resistivity value by formulating the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state using Equation 17 (described later). Using the power factor β as the gradient of change, the relationship between the moisture content of concrete and the water binder ratio of concrete in the fully saturated state is formulated and evaluated using the relational expression. Means for calculating the volume resistivity by calculating the natural logarithm of the volume resistivity corresponding to the natural logarithm of the moisture content calculated by substituting the value of the water binder ratio calculated in advance for the concrete of Formulating the relationship between the volume resistivity of concrete and the effective diffusion coefficient of chloride ions in the saturated state, and substituting the estimated volume resistivity into the estimated relationship, the effective diffusion of chloride ions Means for estimating the coefficient.

Furthermore, the concrete physical property value evaluation program of the present invention corresponding to the first embodiment includes a measured value of moisture content obtained by measuring moisture content and measuring volume resistivity of the concrete to be evaluated, and Means for reading the combined data with the measured volume resistivity value and the water binder ratio value calculated in advance for the concrete to be evaluated from the internal storage device or the external storage device, the measured value and volume of the moisture content on the logarithmic axis It was estimated from the combination data with the measured resistivity value by formulating the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state using Equation 17 (described later). Using the power factor β as the gradient of change, the relationship between the moisture content of concrete in the fully saturated state and the water binder ratio of the concrete is formulated and evaluated as a relational expression. Means for calculating the volume resistivity by calculating the natural logarithm of the volume resistivity corresponding to the natural logarithm of the moisture content calculated by substituting the value of the water binder ratio calculated in advance for the concrete to be priced; Formulating the relationship between the volume resistivity of concrete and the effective diffusion coefficient of chloride ions in the fully saturated state, substituting the estimated volume resistivity into the estimated relationship, and calculating the effective chloride ion The computer functions as a means for estimating the diffusion coefficient.

  Hereinafter, the first embodiment will be specifically described.

  First, the concrete property value evaluation method according to the present invention is roughly divided into a preparation stage (S1) for estimating the effective diffusion coefficient of chloride ions of concrete and a measurement stage for estimating the effective diffusion coefficient ( S2) and an evaluation stage (S3) for estimating the effective diffusion coefficient.

  In this embodiment, as a preparatory stage (S1) for estimating the effective diffusion coefficient of chloride ions of concrete, the relationship between the moisture content and the volume resistivity of concrete in a fully saturated state is formulated. Performing step (S1-1), formulating the relationship between the volume resistivity of concrete in fully saturated state and the effective diffusion coefficient of chloride ions (S1-2), and concrete in fully saturated state A step (S1-3) of formulating a relationship between the moisture content of the water and the water binder ratio representing the quality of the concrete.

  In addition, as a measurement step (S2) for estimating the effective diffusion coefficient of chloride ions of concrete, a step of acquiring combination data of a measured value of moisture content and a measured value of volume resistivity for the concrete to be evaluated Have

  Furthermore, as an evaluation stage (S3) for estimating the effective diffusion coefficient of chloride ions of concrete, a step (S3-1) of reading moisture content measurement value data and volume resistivity measurement value data regarding the concrete to be evaluated; The step of estimating the volume resistivity in the fully saturated state (S3-2) and the step of estimating the effective diffusion coefficient of chloride ions in the fully saturated state (S3-3).

Of the preparation stage (S1) for estimating the effective diffusion coefficient of chloride ions of concrete, the step of formulating the relationship between the moisture content and the volume resistivity of concrete in a fully saturated state (S1- In 1), specifically, the combination of the measured value w _s0 [%] of the moisture content of concrete in the fully saturated state (in other words, at the time of saturation) and the measured value ρ _s0 [Ω · m] of the volume resistivity A plurality of data is used to formulate the relationship between these moisture content and volume resistivity.

As the combination data of the moisture content w _s0 and the volume resistivity ρ _s0 in the fully saturated state used in this step (S1-1) as the preparation stage, for example, an independent measurement or an investigation of existing literature is performed. The combination data group acquired and collected by doing is used.

When conducting the actual measurement, for example, actually measuring the moisture content and volume resistivity (electrical resistivity) of concrete that is in a fully saturated state, and measuring the moisture content obtained by measuring the moisture content. The combination data of the value w _s0 [%] and the measured volume resistivity ρ _s0 [Ω · m] obtained by measuring the volume resistivity is arranged. Note that at least the number of combination data that can be subjected to regression analysis described later is arranged. For example, a plurality of combination data is acquired and organized by performing actual measurement at a certain period of age (that is, the number of days elapsed from demolding).

  In the present invention, the specific method for actually measuring the moisture content is not limited to a specific one as long as the moisture content of the concrete can be obtained. Specifically, for example, it is conceivable to perform actual measurement using a moisture meter. In addition, since the moisture content meter is already prevalent, and the actual measurement of the moisture content using the moisture content meter is a well-known method, the details are omitted here. The moisture content includes a mass-based mass moisture content and a volume-based volumetric moisture content. In the present invention, the mass-based mass moisture content is used.

  In the present invention, the specific method for measuring the volume resistivity is not limited to a specific one as long as the volume resistivity of the concrete can be obtained. Concretely, for example, using the electrical resistance measuring instrument, Japan Society of Civil Engineers standard "Method of measuring volume resistivity of cross-sectional restoration material by four-electrode method (draft) (JSCE-K562-2008)" (JST: 2010) (Standards), Maruzen, 2010).

Moreover, the moisture content in the fully saturated state as an experimental result / measured result published in the literature as a combination data of the measured value w _s0 of the concrete moisture content in the fully saturated state and the measured value ρ _s0 of the volume resistivity. Combination data of w _s0 and volume resistivity ρ _s0 may be collected and organized. By investigating existing literature, it is expected that the data on the age of the material can be collected without actually taking the time corresponding to the material age.

  It should be noted that the combination data acquired and arranged by actually measuring and the combination data collected and arranged by investigating existing documents may be used in an integrated manner. In addition, when age dependency is not found in the value of the effective diffusion coefficient of chloride ion of concrete in a period of less than 6 months or less than 1 year, for example, the age dependency is You may make it exclude the data of the period which cannot be seen.

ここに、 ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
α，β：実験定数
をそれぞれ表す。 Then, by performing regression analysis on the assumption of the power function shown in Formula 17 using the organized combination data, the relationship between the moisture content and the volume resistivity in the fully saturated state is formulated (specifically, For example, the experimental constants α and β are estimated using the least squares method). Note that the fact that the relationship between two variables can be regressed by a power function means that a plot of combined data of these two variables is distributed on a straight line (and its vicinity) on both logarithmic axes.

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Respectively.

  Note that the formulation of the relationship between the moisture content and the volume resistivity may be performed for each category by setting a category (category) according to the attribute of the concrete or the attribute of the actual measurement method.

  Specifically, for example, in the mixed cement mixed with fly ash cement or the like, the pore structure of the hardened body is greatly different from that of ordinary cement, and affects the macroscopic physical property value such as the diffusion coefficient. In view of this, among the attributes of concrete, as a classification related to the type of binder, it may be classified into a normal cement type and a mixed cement type.

  In addition, since a certain capacity component is found in concrete, it is conceivable that the type of applied current in actual measurement of volume resistivity affects the actual measurement result of volume resistivity. Therefore, among the attributes of the actual measurement method, the classification relating to the type of applied current in the actual measurement of volume resistivity may be classified into direct current and alternating current.

  In addition, when chloride ions in seawater enter the solution in the pores, the chloride ions greatly affect the ionic strength of the pore solution. Moreover, the volume resistivity of the concrete observed by the actual measurement of the volume resistivity reflects the volume of the pore solution inside the concrete and its liquid resistance. Therefore, the concrete attribute may be classified according to the presence or absence of salt in the pore solution inside the concrete.

  In addition, regarding the attributes of concrete, it may be classified according to the value of the water binder ratio as a classification related to the mixing condition of the concrete, or classified according to the curing type such as standard curing, air curing, and wet curing as the classification regarding the curing conditions. You may make it do.

Next, in the step of formulating the relationship between the volume resistivity of concrete in the fully saturated state and the effective diffusion coefficient of chloride ions (S1-2), specifically, in the fully saturated state (in other words, The volume resistivity of the concrete (when saturated) ρ _s0 [Ω · m] and the actual measured value of the effective diffusion coefficient of chloride ions D _s0 [cm ² / year] are used in combination. The relationship between resistivity and the effective diffusion coefficient of chloride ions is formulated.

As the combination data of the volume resistivity ρ _s0 in the fully saturated state and the effective diffusion coefficient D _s0 of chloride ions used in this step (S1-2) as the preparation stage, for example, an original measurement is performed or existing literature is used. A combination data group acquired and collected by investigating and the like is used.

When conducting the actual measurement independently, for example, by measuring the volume resistivity (electrical resistivity) and the effective diffusion coefficient of chloride ions for concrete that is completely saturated, the volume resistivity is obtained. The combined data of the obtained measured value ρ _s0 [Ω · m] of the volume resistivity and the measured value D _s0 [%] of the effective diffusion coefficient obtained by measuring the effective diffusion coefficient of chloride ions is arranged. Note that at least the number of combination data that can be subjected to regression analysis described later is arranged.

  The actual measurement of the volume resistivity is the same as in the case of the process of S1-1.

  On the other hand, the actual measurement of the effective diffusion coefficient of chloride ions is not limited to a specific method as long as the effective diffusion coefficient of chloride ions in the concrete can be obtained. Specifically, for example, the Japan Society of Civil Engineers "Effective Diffusion Coefficient Testing Method for Chloride Ions in Concrete by Electrophoresis (Draft) (JSCE-G571-2010)" , Maruzen, 2010), it is conceivable to perform actual measurements.

In addition, as the combined data of the actual measured volume resistivity ρ _s0 of concrete in the fully saturated state and the actual measured value D _s0 of the effective diffusion coefficient of chloride ions, the experimental results and actual measured results published in the literature etc. Combination data of the volume resistivity ρ _s0 in saturation and the effective diffusion coefficient D _s0 of chloride ions may be collected and organized.

  It should be noted that the combination data acquired and arranged by actually measuring and the combination data collected and arranged by investigating existing documents may be used in an integrated manner. In addition, when age dependency is not found in the value of the effective diffusion coefficient of chloride ion of concrete in a period of less than 6 months or less than 1 year, for example, the age dependency is You may make it exclude the data of the period which cannot be seen.

ここに、 Ｄ_s：完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数
〔cm²／年〕，
ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
γ，ε：実験定数
をそれぞれ表す。 Then, by performing regression analysis using the organized combination data, the relationship between the volume resistivity in the fully saturated state and the effective diffusion coefficient of chloride ions is formulated (specifically, for example, the minimum two Estimate experimental constants using multiplication). Note that the function form for performing regression analysis is not limited to a specific one, and the best match is achieved by plotting combined data of volume resistivity and effective diffusion coefficient of chloride ion on a graph, for example. Then, the function form considered is selected as appropriate. Specifically, the experimental constants γ and ε are estimated by performing regression analysis using a power function expressed by Equation 18, for example.

Where D _s is the effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm ² / year],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
γ, ε: experimental constant
Respectively.

  It should be noted that the formulation of the relationship between the volume resistivity and the effective diffusion coefficient of chloride ions may be performed for each category by setting a category (category) according to the attribute of the concrete or the attribute of the measurement method. In this case, examples of the classification are the same as those described in the description of the process of S1-1.

  Furthermore, in the step (S1-3) of formulating the relationship between the moisture content of concrete in the fully saturated state and the water binder ratio representing the quality of the concrete, specifically, in the fully saturated state A combination of the measured value ws0 [%] of the concrete moisture content and the calculated value W / B [%] of the concrete water binder ratio is used, and the relationship between these moisture content and water binder ratio is Formulated.

As combined data of the moisture content w _s0 of concrete in the fully saturated state and the water binder ratio W / B of concrete used in this step (S1-3) as a preparation stage, for example, existing literature is investigated. The combination data group collected by this is used. The water binder ratio W / B is calculated based on the mixing conditions of the concrete cement. Further, at least the number of combination data that can be subjected to the regression analysis described later is arranged.

ここに、 ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
Ｗ／Ｂ：コンクリートの水結合材比の計算値〔％〕，
ζ，κ：実験定数
をそれぞれ表す。 Then, by performing regression analysis using the collected and organized combination data, the relationship between the moisture content of concrete in a fully saturated state and the water binder ratio representing the quality of concrete is formulated (specifically (For example, the experimental constant is estimated using the least square method). It should be noted that the function form for performing regression analysis is not limited to a specific one, and a function that is considered to best match, for example, by plotting the combination data of the moisture content and the water binder ratio on a graph. The shape is appropriately selected. Specifically, for example, the experimental constants ζ and κ are estimated by performing regression analysis using a power function represented by Formula 19.

Where w _s : moisture content of concrete in fully saturated state [%],
W / B: Calculated value of water binder ratio of concrete [%],
ζ, κ: experimental constant
Respectively.

  It should be noted that the formulation of the relationship between the moisture content and the water binder ratio may be performed for each category by setting a category (category) according to the attribute of the concrete or the attribute of the actual measurement method. Examples of the classification are the same as those described in the description of the processing of S1-1.

  Subsequently, as a process related to the measurement step (S2) for estimating the effective diffusion coefficient of chloride ions of concrete, acquisition of combined data of the measured value of moisture content and the measured value of volume resistivity for the concrete to be evaluated Is done.

Specifically, the moisture content is measured for the evaluation target concrete (actual structure) to obtain the moisture content measurement value w ₁ [%], and the volume resistivity (electric resistivity) is measured. To obtain a measured value ρ ₁ [Ω · m] of the volume resistivity.

  In addition, about the measurement of a moisture content, and the measurement of volume resistivity (electrical resistivity), it is the same as that of the case of the process of said S1-1.

  Then, the process which concerns on the evaluation stage (S3) which estimates the effective diffusion coefficient of the chloride ion of concrete is performed.

  Here, the processing according to the evaluation step (S3) for estimating the effective diffusion coefficient of chloride ions of the concrete in the evaluation method of the concrete property value of the present invention can be realized by the concrete property value evaluation apparatus of the present invention. .

  And the process which concerns on the evaluation step (S3) which estimates the effective diffusion coefficient of the chloride ion of concrete in the evaluation method of the above-mentioned concrete physical property value, and the evaluation apparatus of the concrete physical property value which implement | achieves the said process are the concrete of this invention It can also be realized by executing a physical property value evaluation program on a computer. In this specification, a concrete physical property value evaluation apparatus is realized by executing a concrete physical property value evaluation program on a computer, and an effective diffusion coefficient of concrete chloride ions in the concrete physical property value evaluation method is estimated. The case where the process which concerns on an evaluation stage (S3) is implemented is demonstrated.

  FIG. 2 shows the overall configuration of a computer 10 (which is also a concrete property value evaluation apparatus 10 in this embodiment) for executing the concrete property value evaluation program 17. This computer 10 (concrete physical property evaluation device 10) includes a control unit 11, a storage unit 12, an input unit 13, a display unit 14, and a memory 15, and is connected to each other by a signal line such as a bus. In addition, a data server 16 as a storage device is connected to the computer 10 (concrete physical property evaluation device 10) by a signal line such as a bus, and transmission and reception of signals such as data and control commands via the signal line ( That is, input / output) is performed mutually.

  The control unit 11 performs control related to the overall control of the computer 10 (concrete property value evaluation device 10) and the evaluation process of the concrete property value by the concrete property value evaluation program 17 stored in the storage unit 12, For example, a CPU (Central Processing Unit).

  The storage unit 12 is a device that can store at least data and programs, and is, for example, a hard disk.

  The memory 15 serves as a memory space that is a work area when the control unit 11 executes various controls and operations, and is a RAM (Random Access Memory), for example.

  The input unit 13 is an interface for giving at least an operator's command to the control unit 11, and is, for example, a keyboard.

  The display unit 14 performs drawing / display of characters, graphics, and the like under the control of the control unit 11 and is, for example, a display.

  And in this embodiment, the moisture content and volume resistivity in the fully saturated state estimated in the process of S1-1 of the preparatory stage (S1) for estimating the effective diffusion coefficient of the chloride ion of the above-mentioned concrete Between the value of the power coefficient β to be an experimental constant in the relational expression (Equation 17), and the volume resistivity and the effective diffusion coefficient of chloride ions in the fully saturated state formulated in the process of S1-2. Relational expressions (specifically, values of function form and experimental constants; for example, Equation 18 and experimental constants γ, ε), and water content and water binding in the fully saturated state formulated in the processing of S1-3 A relational expression between the material ratios (specifically, a function form and values of experimental constants; for example, Expression 19 and experimental constants γ, ε) is defined in advance in the evaluation program 17 for concrete property values. In addition, when the said coefficient and relational expression are estimated for every classification | category, such as an attribute of concrete and an attribute of the measurement method, the said coefficient and relational expression are prescribed | regulated by matching with the identifier for every classification | category. In addition, the coefficient and the relational expression are not defined in the concrete property value evaluation program 17, but the reference file in which the coefficient or the relational expression is defined is the storage unit 12 or the external storage device which is an internal storage device. The reference file may be stored in advance in the data server 16 and referred to by the concrete property value evaluation program 17 as necessary.

Furthermore, the measured value w ₁ of the moisture content of the evaluation target concrete (actual structure) obtained and measured in the process of the measurement step (S2) for estimating the effective diffusion coefficient of chloride ions of the concrete. Combination data of [%] and the measured value ρ ₁ [Ω · m] of the volume resistivity is stored (saved) in advance in the data server 16 as the measured value database 18. In addition, when there are a plurality of evaluation targets (for example, when there are a plurality of evaluation target concrete structures or when there are a plurality of evaluation target portions in a certain concrete structure), they are associated with identifiers for each evaluation target. The combination data of the measured value w ₁ [%] of the moisture content and the measured value ρ ₁ [Ω · m] of the volume resistivity is recorded.

In the present invention, the database 10 or the data file in which the data of the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity are stored (stored) is the computer 10 (the evaluation device for the concrete property value). The storage unit is not limited to the data server 16 as long as the control unit 11 can be accessed. Specifically, for example, it may be stored in the storage unit 12 that is an internal storage device, or may be stored in various storage media such as an optical storage medium or an external storage device.

  Further, the water binder ratio of the evaluation target concrete (actual structure) is stored (saved) in advance in the data server 16 as the water binder ratio data file 19. The water binder ratio data of the concrete to be evaluated is calculated in advance as one of the processes of the preparation stage (S1) for estimation, for example, based on specifications such as design and construction. Keep it organized. When there are a plurality of evaluation targets, calculated value data of the water binder ratio is recorded in association with the identifier for each evaluation target.

  In the present invention, the data file 19 in which the calculated data of the water binder ratio is stored (stored) is a memory accessible by the control unit 11 of the computer 10 (concrete physical property evaluation device 10). Any device can be used, and is not limited to the data server 16. Specifically, for example, it may be stored in the storage unit 12 that is an internal storage device, or may be stored in various storage media such as an optical storage medium or an external storage device.

Then, the control unit 11 of the computer 10 (which is also the concrete property value evaluation apparatus 10 in the present embodiment) executes the concrete property value evaluation program 17 so that the moisture content of the concrete to be evaluated is reduced. Combined data of the measured value of moisture content and the measured value of volume resistivity obtained by measuring and measuring the volume resistivity and the value of the water binder ratio calculated in advance for the concrete to be evaluated as a storage device The data reading unit 11a as a means for reading from the data server 16, the combination of the measured value of the moisture content and the measured value of the volume resistivity on the logarithmic axis, the moisture content w of the concrete in the fully saturated state using Equation 17 as the slope of change in the coefficient of power β, which is estimated by performing the formulation of the relationship between _s and the volume resistivity [rho _s, completely The natural ratio of moisture content calculated by substituting the value of water binder ratio into the relational expression estimated by formulating the relation between the moisture content of concrete in the summed state and the water binder ratio of concrete. The volume resistivity estimating unit 11b as a means for calculating the volume resistivity by calculating the natural logarithm of the volume resistivity corresponding to the numerical value, the volume resistivity of concrete in the fully saturated state and the effective diffusion coefficient of chloride ions An effective diffusion coefficient estimation unit 11c is configured as means for estimating the effective diffusion coefficient of chloride ions by substituting the estimated volume resistivity into the relational expression estimated by formulating the relationship between the two.

  In executing the process related to the evaluation stage (S3) for estimating the effective diffusion coefficient of chloride ions of concrete, the data reading unit 11a of the control unit 11 measures the moisture content measurement value data and volume resistivity measurement of the concrete to be evaluated. The value data is read (S3-1).

Specifically, the data reading unit 11 a measures the measured moisture content w ₁ of the concrete to be evaluated, which is measured and acquired in the process of S 2 and recorded in the measured value database 18 stored in the data server 16. %] And the measured value ρ ₁ [Ω · m] of the volume resistivity are read from the data server 16. Then, the data reading unit 11 a stores in the memory 15 the combination data of the read measurement value w _{1 of the} moisture content and the measurement value ρ ₁ of the volume resistivity. If there are a plurality of evaluation targets, the identifier for each evaluation target is read and the combination data is stored in association with the identifier.

  The data reading unit 11 a further receives from the data server 16 the calculated value data of the water binder ratio of the concrete to be evaluated, which is calculated in advance and recorded in the water binder ratio data file 19 stored in the data server 16. Read. Then, the data reading unit 11a stores the read calculated value data of the water binder ratio in the memory 15.

  Next, the volume resistivity estimating unit 11b of the control unit 11 estimates the volume resistivity in a fully saturated state (S3-2). In addition, when there are a plurality of evaluation targets, the processing after S3-2 is performed for each evaluation target (specifically, for each portion of the concrete structure, in other words, for each identifier of the evaluation target). The description is omitted in the processing.

The volume resistivity estimation unit 11b reads the combination data of the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity stored in the memory 15 in the process of S3-1 from the memory 15, and calculates the moisture content. The natural logarithm log (w ₁ ) of the measured value w _{1 and} the natural logarithm log (ρ ₁ ) of the measured value ρ ₁ of the volume resistivity are calculated, and the calculated natural logarithm log (w ₁ ), log (ρ ₁ ) is stored in the memory 15.

The volume resistivity estimating unit 11b also reads the calculated data of the water binder ratio stored in the memory 15 in the process of S3-1 from the memory 15, and is completely defined in the concrete property value evaluation program 17. The moisture content in the fully saturated state is calculated by substituting into the relational expression between the moisture content of the concrete in the saturated state and the water binder ratio of the concrete. Then, the natural logarithmic value log (w _sc ) of the calculated value w _sc of the saturation water content is calculated, and the calculated natural logarithmic value log (w _sc ) is stored in the memory 15.

Then, the volume resistivity estimation unit 11b assumes the change on the logarithmic axis, and the natural logarithm log (w ₁ ) of the measured value w ₁ of the moisture content and the natural logarithm log of the measured value ρ ₁ of the volume resistivity. From the point of combination with (ρ ₁ ), the relational expression between the moisture content and the volume resistivity in the fully saturated state estimated in the processing of S1-1 and defined in the evaluation program 17 of the concrete property value ( The natural logarithmic value log (ρ _sc ) of the volume resistivity at the time of saturation corresponding to the natural logarithm log (w _sc ) of the calculated value w _sc of the water content at saturation, using the power coefficient β in Equation 17) as the gradient of change. Is calculated to estimate the volume resistivity ρ _sc at saturation (see FIG. 3).

  In addition, when the coefficient of power β is estimated for each category such as the attribute of the concrete and the attribute of the measurement method in the process of S1-1, the coefficient β of the power of the category corresponding to the attribute of the concrete to be evaluated or the like. Is used.

Then, the volume resistivity estimating unit 11 b stores the estimated volume resistivity ρ _sc at saturation in the memory 15.

  Next, the effective diffusion coefficient estimation unit 11c of the control unit 11 estimates the effective diffusion coefficient of chloride ions in a completely saturated state (S3-3).

Specifically, the effective diffusion coefficient estimating unit 11c, the volume resistivity [rho _sc at saturation stored in the memory 15 in the processing of S3-2 is read from the memory 15, the volume resistivity [rho _sc at the saturation, In the relational expression (for example, Expression 18) between the volume resistivity in the fully saturated state and the effective diffusion coefficient of chloride ion, which is formulated in the evaluation program 17 of the concrete physical property value formulated in the process of S1-2. Substituting into the volume resistivity ρ _s in the fully saturated state, the effective diffusion coefficient D _s of chloride ions in the fully saturated state is estimated.

Then, the effective diffusion coefficient estimation unit 11c displays the estimated value of the effective diffusion coefficient D _s of chloride ions on the display unit 14, or stores it in the storage unit 12 or the data server 16 as an estimation result data file. .

  And the control part 11 complete | finishes the process of evaluation of a concrete physical property value (END).

  According to the evaluation method, evaluation apparatus, and evaluation program for the physical property values of the first embodiment configured as described above, the experimental constants and experimental formulas obtained in advance by estimation and the concrete to be evaluated (actual structure) Since the effective diffusion coefficient of chloride ions is estimated using the water content and volume resistivity measured in, the effective diffusion coefficient of chloride ions is estimated only by input conditions that can be set realistically. And estimate the effective diffusion coefficient of chloride ions at any point in the actual structure without damaging the actual structure and thus without being affected by the arrangement of steel within the actual structure. Can do.

  Furthermore, experimental constants and equations for estimating the effective diffusion coefficient of chloride ions can be estimated in advance, and moisture content and volume resistivity can be measured without destroying the actual structure. Since it is possible to estimate the effective diffusion coefficient of chloride ion only by this, the effective diffusion coefficient of chloride ion can be immediately estimated at the site where the concrete structure to be evaluated is located.

  The first embodiment described above is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention. For example, in the first embodiment described above, the power coefficient β in Equation 17 which is a relational expression between the moisture content and the volume resistivity of concrete in a fully saturated state is directly used as the gradient of change on the logarithmic axis. Is used to estimate the effective diffusion coefficient of chloride ions, but the use of the power coefficient β in Equation 17 is not limited to this, and the logarithm logarithm is used to estimate the effective diffusion coefficient of chloride ions. It is also possible to use Formula 20 (described later) incorporating a power coefficient β that should be the gradient of the change on the axis (second embodiment; see FIGS. 4 and 5).

The concrete physical property value evaluation method of the present invention corresponding to the second embodiment formulates the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state using Equation 17. A step of estimating the power factor β, a step of formulating the relationship between the volume resistivity ρ _s of concrete in a fully saturated state and the effective diffusion coefficient of chloride ions, Formulating the relationship between the moisture content w _s of concrete in the saturated state and the water binder ratio of the concrete to estimate the relationship, and measuring the moisture content and volume resistance for the concrete to be evaluated In the relational expression between the step of obtaining the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity and measuring the volume resistivity ρ _s and the effective diffusion coefficient of chloride ions Included in volume resistivity ρ _s Substituting Equation 20 (described later), which is a relational expression between the water content w _s and the volume resistivity ρ _s, and the water content w _s and the water binder ratio into the water content w _s in the formula after the substitution In the formula obtained by substituting the relational expression between the measured value w ₁ of the moisture content of the concrete to be evaluated, the measured value ρ ₁ of the volume resistivity, and the water binder ratio calculated in advance for the concrete to be evaluated And substituting the value of to estimate the effective diffusion coefficient of chloride ions.

Moreover, the concrete physical property value evaluation apparatus of the present invention corresponding to the second embodiment is a moisture content measurement value w obtained by measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated. and means for reading the value of pre-calculated water binding agent ratio for the combination data and evaluated concrete between ₁ and measured value [rho ₁ of the volume resistivity from the internal storage device or external storage device, further, using equation 17 Formulation of the relationship between concrete moisture content w _s and volume resistivity ρ _s in fully saturated state to estimate power factor β, and volume resistivity ρ _s of concrete and chloride in fully saturated state between the water content of the concrete at full saturation as well as estimate the formulate performed by equation w _s and concrete water binder ratio relationship between the effective diffusion coefficient of the object ion Performing formulation engagement Estimate relation, and, the volume resistivity [rho _s and moisture content w _s and volume resistance in volume resistivity [rho _s in relation between the effective diffusion coefficient of chloride ions substituting equation between equation 20 (infra) wherein the water content w _s and water binder ratio water content w _s in the formula and assignment as well as substituting a relationship between the rate [rho _s Substituting into the equation obtained the measured water content w ₁ of the concrete to be evaluated, the measured volume resistivity ρ _{1 and the} value of the water binder ratio previously calculated for the concrete to be evaluated. Means for estimating the effective diffusion coefficient of the product ions.

Furthermore, the concrete physical property value evaluation program of the present invention corresponding to the second embodiment is a moisture content measurement value w obtained by measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated. It means for reading the value of pre-calculated water binding agent ratio for the combination data and evaluated concrete between ₁ and measured value [rho ₁ of the volume resistivity from the internal storage device or external storage device, further, completely using equation 17 Formulation of the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the saturated state to estimate the power coefficient β, and the concrete volume resistivity ρ _s and chloride in the fully saturated state the water content of the concrete at full saturation as well as estimate the formulate performed by equation w _s and concrete water binder ratio relationship between the effective diffusion coefficient of the ions and Performing formulate relationships between Estimate relation, and, with the volume resistivity [rho _s and moisture content w _s in volume resistivity [rho _s in relation between the effective diffusion coefficient of chloride ions Substituting Equation 20 (described later) between the volume resistivity ρ _s and the relationship between the water content w _s and the water binder ratio into the water content w _s in the equation after substitution. Substituting into the equation obtained by substituting the measured water content w ₁ of the concrete to be evaluated, the measured volume resistivity ρ ₁ of the concrete and the water binder ratio value calculated in advance for the concrete to be evaluated. The computer functions as a means for estimating the effective diffusion coefficient of chloride ions.

  Hereinafter, the second embodiment will be specifically described focusing on a configuration different from the first embodiment.

  In the case of the second embodiment, first, the processes from S1-1 to S1-3 are performed as in the first embodiment.

  And in 2nd embodiment, the moisture content and volume resistivity in the perfect saturation state estimated in the process of S1-1 of the preparatory stage (S1) for estimating the effective diffusion coefficient of the chloride ion of concrete Between the value of the power coefficient β to be an experimental constant in the relational expression (Equation 17), and the volume resistivity and the effective diffusion coefficient of chloride ions in the fully saturated state formulated in the process of S1-2. The value of the experimental constant (ε, γ in the example of Equation 18) in the relational expression (for example, Equation 18), and the water content and water binder ratio in the fully saturated state formulated in the processing of S1-3 The values of the experimental constants (ζ, κ in the example of Equation 19) in the relational expression (for example, Equation 19) are defined in advance in the concrete property value evaluation program 17.

  Further, the mathematical expression 20 which is a relational expression between the water content and the volume resistivity is substituted for the volume resistivity in the relational expression between the volume resistivity and the effective diffusion coefficient of chloride ions in the fully saturated state. Substituting the relational expression between the water content in the fully saturated state and the water binder ratio into the water content in the following equation and organizing the variables, the measured values of the moisture content of concrete and the measured values of volume resistivity, An expression based only on the water binder ratio (hereinafter referred to as an effective diffusion coefficient estimation expression) is defined in advance in the concrete property value evaluation program 17. It should be noted that Expression 18 is used as a relational expression between the volume resistivity in the fully saturated state and the effective diffusion coefficient of chloride ions, and Expression 19 is used as a relational expression between the water content in the fully saturated state and the water binder ratio. Is used, the effective diffusion coefficient estimation formula is the formula shown in Formula 21.

ここに、 ｗ_s：完全飽和状態におけるコンクリートの含水率〔％〕，
ρ_s：完全飽和状態におけるコンクリートの体積抵抗率〔Ω・ｍ〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
β：実験定数
をそれぞれ表す。

Where w _s : moisture content of concrete in fully saturated state [%],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
β: Experimental constant
Respectively.

ここに、 Ｄ_e：完全飽和状態におけるコンクリートの塩化物イオンの実効拡散係数
〔cm²／年〕，
ｗ₁：コンクリートの含水率の計測値〔％〕，
ρ₁：コンクリートの体積抵抗率の計測値〔Ω・ｍ〕，
Ｗ／Ｂ：コンクリートの水結合材比〔％〕，
β：完全飽和状態におけるコンクリートの含水率と体積抵抗率との間の関
係式に関する実験定数，
ε，γ：完全飽和状態におけるコンクリートの体積抵抗率と塩化物イオン
の実効拡散係数との間の関係式に関する実験定数，
ζ，κ：完全飽和状態でのコンクリートの含水率とコンクリートの水結合
材比との間の関係式に関する実験定数
をそれぞれ表す。

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm ² / year],
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
W / B: Concrete water binder ratio [%],
β: Relationship between moisture content and volume resistivity of concrete in fully saturated state
Experimental constant for the equation,
ε, γ: Volume resistivity and chloride ion of concrete in fully saturated state
An experimental constant for the relation between the effective diffusion coefficient of
ζ, κ: Moisture content of concrete and water bonding of concrete in fully saturated state
Experimental constants on the relational expression between material ratios
Respectively.

  Then, following the process of S1, the process of S2 is performed as in the first embodiment.

  In the second embodiment as well, the combination data of the measurement value of the moisture content and the measurement value of the volume resistivity for the evaluation target concrete measured and acquired in the process of S2 is stored in the data server 16 as the measurement value database 18. The calculated value data of the water binder ratio of the concrete to be evaluated is stored in the data server 16 in advance as a water binder ratio data file 19 while being stored (saved) in advance.

In the second embodiment, the control unit 11 of the computer 10 (which is also a concrete property value evaluation apparatus 10) executes a concrete property value evaluation program 17 so that the concrete to be evaluated contains water. Of the combination of the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity obtained by measuring the volume resistivity and the volume resistivity, and the water binder ratio calculated in advance for the concrete to be evaluated Formulating the relationship between the moisture content w _s and the volume resistivity ρ _s of the concrete in a completely saturated state using the data reading unit 11a as a means for reading the value from the data server 16 as a storage device, and further using Equation 17 the conducted to estimate the coefficients of the powers beta, the volume resistivity of the concrete in a fully saturated state [rho _s and the effective diffusion coefficient of chloride ions Estimate relation performing formulation of the relationship between the water content w _s and concrete water binder ratio of the concrete in a fully saturated state with performing formulated to estimate the relationship of the relationship, and In addition, Equation 20 which is a relational expression between the water content w _s and the volume resistivity ρ _s is added to the volume resistivity ρ _s in the relational expression between the volume resistivity ρ _s and the effective diffusion coefficient of chloride ions. The measured value of the moisture content of the concrete to be evaluated into the formula obtained by substituting the relational expression between the moisture content w _s and the water binder ratio into the moisture content w _s in the formula after substitution. Effective diffusion coefficient estimation section 11b as means for estimating the effective diffusion coefficient of chloride ions by substituting the measured value ρ _{1 of} w ₁ and volume resistivity and the value of the water binder ratio calculated in advance for the concrete to be evaluated Is configured.

  Then, the process of S3-1 is performed as in the first embodiment. At this time, in 2nd embodiment, the data reading part 11a adds to the combination data of the measured value of the moisture content of the concrete to be evaluated and the measured value of the volume resistivity, and the water binder ratio of the concrete to be evaluated. Values are also read from the data server 16 (measurement value database 18) and stored in the memory 15.

  Thereafter, the process of S3-2 in the first embodiment is not performed, and the process of estimating the effective diffusion coefficient of chloride ions in a completely saturated state (S3-2) is performed.

Specifically, the effective diffusion coefficient estimation unit 11b of the control unit 11 in the second embodiment is configured to measure the moisture content measurement value w ₁ and the volume resistivity measurement value ρ stored in the memory 15 in the process of S3-1. The combination data with ₁ and the value of the water binder ratio are read from the memory 15, and the measured value w _{1 of the} moisture content, the measured value ρ ₁ of the volume resistivity, and the water binder ratio W / B are evaluated for the physical property values. by substituting the effective diffusion coefficient estimation expression to estimate the effective diffusion coefficient D _e of chloride ions as defined in the program 17.

  According to the evaluation method, the evaluation apparatus, and the evaluation program for the physical property values of the second embodiment configured as described above, the experimental constant and the experimental formula obtained in advance by estimation and the concrete to be evaluated (actual structure) Since the effective diffusion coefficient of chloride ions is estimated using the water content and volume resistivity measured in, the effective diffusion coefficient of chloride ions is estimated only by input conditions that can be set realistically. And estimate the effective diffusion coefficient of chloride ions at any point in the actual structure without damaging the actual structure and thus without being affected by the arrangement of steel within the actual structure. Can do.

  Furthermore, experimental constants and equations for estimating the effective diffusion coefficient of chloride ions can be estimated in advance, and moisture content and volume resistivity can be measured without destroying the actual structure. Since it is possible to estimate the effective diffusion coefficient of chloride ion only by this, the effective diffusion coefficient of chloride ion can be immediately estimated at the site where the concrete structure to be evaluated is located.

Moreover, while using Formula 21 as the effective diffusion coefficient estimation formula in the second embodiment described above, the values shown in Table 2 may be used as the experimental constants β, ε, γ, ζ, and κ in Formula 21. (Third embodiment: The overall configuration of a computer 10 (concrete property value evaluation apparatus 10) for executing the concrete property value evaluation program 17 is the same as that of the second embodiment (see FIG. 5)).

  The value of each experimental constant shown in Table 2 is an experiment estimated by regression analysis on the assumption of Equation 17 using the data acquired by the inventor by original measurement and the data collected by the investigation of literatures, etc. Is the value of the constant β, the values of the experimental constants ε, γ estimated by the regression analysis assuming the mathematical formula 18, and the experimental constants ζ, κ estimated by the regression analysis based on the mathematical formula 19 Is the value of In addition, all the measurements used as the basis of estimation of the value of each experimental constant shown in Table 2 are those at 20 ° C. For this reason, when the actual environment to which the actual structure is exposed is not 20 ° C., it is necessary to correct the temperature by referring to, for example, a past research example or using the function of the measuring device.

  In addition, the experimental constants shown in Table 2 were estimated by classifying the types of binders into ordinary cement type and mixed cement type and classifying the salt content in the pore solution inside the concrete with and without. is there.

  The estimation of the experimental constants in Table 2 is a method for estimating the characteristics of a population from a small number of data. For example, in an experiment in which it is difficult to collect a large number of data and the number of data is limited. The Bootstrap method, which is considered to be effective in the analysis of results, was used to improve the problems caused by the small number of data.

  Specifically, the Bootstrap method was applied to the regression analysis based on Formula 17, the regression analysis based on Formula 18, and the regression analysis based on Formula 19. Then, the Bootstrap method was applied to the experimental constants of each empirical formula used for each regression analysis, and the dispersion (σ) was added to the average (μ) of various experimental constants by grasping the variation of each experimental constant. Case (μ + 1.0σ), subtracted (μ−1.0σ) and as-is (μ) are obtained respectively, and evaluated to be slightly overestimated from the actual measured values and corrected to the regression variables when the coefficient of variation is as small as possible I tried to do it.

  In this embodiment, an example in which the Bootstrap method is applied to improve a problem in regression analysis has been described. However, the method used for improving the problem is not limited to the Bootstrap method, and the problem is improved. It is not an essential configuration of the present invention to apply any method including the Bootstrap method to each regression analysis.

And the evaluation method of the concrete physical property value of the present invention corresponding to the third embodiment includes the step of calculating the water binder ratio for the concrete to be evaluated, the measurement of the moisture content and the volume with respect to the concrete to be evaluated In the step of measuring the resistivity to obtain the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity, and the formula 21 (the values shown in Table 2 are used as the values of each experimental constant in the formula) And substituting the measured value w ₁ of the moisture content of the concrete to be evaluated, the measured value ρ ₁ of the volume resistivity, and the water binder ratio of the concrete to be evaluated, and estimating the effective diffusion coefficient of chloride ions. .

Moreover, the concrete physical property value evaluation apparatus of the present invention corresponding to the third embodiment is a measurement value w of the moisture content obtained by measuring the moisture content and measuring the volume resistivity with respect to the concrete to be evaluated. and means for reading the value of pre-calculated water binding agent ratio for the combination data and evaluated concrete between ₁ and measured value [rho ₁ of the volume resistivity from the internal storage device or external storage device, each of the formula 21 (wherein Using the values shown in Table 2 as experimental constant values), the measured water content w ₁ and the measured volume resistivity ρ ₁ of the concrete to be evaluated and the water binder ratio calculated in advance for the concrete to be evaluated And means for substituting to estimate the effective diffusion coefficient of chloride ions.

Furthermore, the concrete physical property value evaluation program of the present invention corresponding to the third embodiment is a moisture content measurement value w obtained by measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated. means for reading the value of pre-calculated water binding agent ratio for the combination data and evaluated concrete between ₁ and measured value [rho ₁ of the volume resistivity from the internal storage device or external storage device, equation 21 (each experiment in the formula Substitute the measured water content w ₁ and the measured volume resistivity ρ ₁ of the concrete to be evaluated and the water binder ratio calculated in advance for the concrete to be evaluated. Thus, the computer functions as a means for estimating the effective diffusion coefficient of chloride ions.

  Hereinafter, the third embodiment will be described specifically with a focus on a different configuration from the first embodiment.

  First, in the case of the third embodiment, each process (S1-1 to S1-3) in the preparation stage (S1) in the first embodiment is not necessary.

  Instead, in the third embodiment, the formula 21 is preliminarily defined in the concrete property value evaluation program 17 as an effective diffusion coefficient estimation formula, and the experiment according to the concrete attribute classification shown in Table 2 is performed. The values of the constants β, ε, γ, ζ, κ are defined in advance in the concrete property value evaluation program 17.

  Then, following the process of S1, the process of S2 is performed as in the first embodiment.

  Here, in the third embodiment, in addition to the combination data of the measurement value of the moisture content and the measurement value of the volume resistivity for the evaluation target concrete measured and acquired in the process of S2, the water of the evaluation target concrete is used. The binder ratio is also stored (saved) in advance in the data server 16 as the measured value database 18. The water binder ratio of the concrete to be evaluated is calculated in advance as one of the preparation stage (S1) processes for estimation based on specifications such as design and construction, and is included in the measurement value database 18. deep.

In the third embodiment, the control unit 11 of the computer 10 (which is also a concrete property value evaluation apparatus 10) executes a concrete property value evaluation program 17 so that the concrete to be evaluated is hydrated. Of the combination of the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity obtained by measuring the volume resistivity and the volume resistivity, and the water binder ratio calculated in advance for the concrete to be evaluated Data reading unit 11a as means for reading values from data server 16 as a storage device, measured value w of moisture content of concrete to be evaluated in equation 21 (using the values shown in Table 2 as the values of the coefficients in the equation) by substituting ₁ and water binder ratio of the concrete measured value [rho ₁ and evaluated for volume resistivity as a means for estimating the effective diffusion coefficient of chloride ions Effective diffusion coefficient estimator 11b is formed.

  Then, the process of S3-1 is performed as in the first embodiment. At this time, in 2nd embodiment, the data reading part 11a adds to the combination data of the measured value of the moisture content of the concrete to be evaluated and the measured value of the volume resistivity, and the water binder ratio of the concrete to be evaluated. Values are also read from the data server 16 (measurement value database 18) and stored in the memory 15.

  Thereafter, the process of S3-2 in the first embodiment is not performed, and the process of estimating the effective diffusion coefficient of chloride ions in a completely saturated state (S3-2) is performed.

Specifically, the effective diffusion coefficient estimation unit 11b of the control unit 11 in the third embodiment is configured to measure the moisture content measurement value w ₁ and the volume resistivity measurement value ρ stored in the memory 15 in the process of S3-1. The combination data with ₁ and the value of the water binder ratio are read from the memory 15, and the measured value w _{1 of the} moisture content, the measured value ρ ₁ of the volume resistivity, and the water binder ratio W / B are evaluated for the physical property values. by substituting the effective diffusion coefficient estimation expression to estimate the effective diffusion coefficient D _e of chloride ions as defined in the program 17.

  According to the concrete physical property value evaluation method, evaluation apparatus, and evaluation program of the third embodiment configured as described above, the effective diffusion coefficient estimation formula obtained in advance by estimation and the concrete to be evaluated (actual structure) Since the effective diffusion coefficient of chloride ions is estimated using the water content and volume resistivity measured in, the effective diffusion coefficient of chloride ions is estimated only by input conditions that can be set realistically. And estimate the effective diffusion coefficient of chloride ions at any point in the actual structure without damaging the actual structure and thus without being affected by the arrangement of steel within the actual structure. Can do.

  Furthermore, the effective diffusion coefficient estimation formula for estimating the effective diffusion coefficient of chloride ions can be estimated in advance, and the moisture content and volume resistivity are measured without destroying the actual structure. Since it is possible to estimate the effective diffusion coefficient of chloride ions only by this, the effective diffusion coefficient of chloride ions can be immediately estimated at the site where the concrete structure is located.

  Further, in the third embodiment described above, the Bootstrap method is applied in the regression analysis, whereas in the first and second embodiments described above, the Bootstrap method is not applied in the regression analysis. In any of the embodiments, in the estimation of experimental constants and empirical formulas, various methods for improving analysis problems based on, for example, the number of data, the data sampling method, and the data dispersion / bias are applied. May be. Specifically, for example, in the present invention, in order to estimate the effective diffusion coefficient of chloride ions simply, inexpensively and in a short time, it is preferable to collect the data used for the estimation by researching existing literature. It is also possible that a sufficient number of data is not collected to ensure the accuracy of the estimation only by examining existing literature. Thus, the Bootstrap method, which is a method for estimating the properties of a population from a small number of data, may be used to improve the problem caused by the small number of data.

The Bootstrap method is one of statistical analysis methods classified into the resampling method proposed by Bradley Efron in 1979. Since the Bootstrap method itself is a well-known technique, the details are omitted here, but the outline is to perform resampling from a sample group and calculate a required statistic (for example, average or variance) for the resampling group. Thus, a quantity of statistic equal to the number of resampling is obtained, and the central limit theorem is applied to the distribution of this statistic to estimate the statistic of the population. In addition, although there is no clear theory about how much resampling should be repeated (that is, the minimum number of times of resampling), it is usually said that it should be repeated 10 ³ to 10 ⁴ times. Since the present invention can be applied even with a small number of sample groups, it is considered effective to apply it to the analysis of the results of experiments in which it is difficult to collect a large amount of data. For this reason, the Bootstrap method may be applied in the estimation of experimental constants and empirical formulas in the present invention.

  An embodiment in which the method for evaluating a physical property value of the present invention is applied to estimation of an effective diffusion coefficient of chloride ions in actual concrete will be described with reference to FIGS.

In this example, a method corresponding to the above-described third embodiment, that is, using the effective diffusion coefficient estimation formula expressed by Formula 21 and the values of each experimental constant shown in Table 2, the concrete to be evaluated is evaluated. Substituting the measured value of water content w ₁ [%] and the measured volume resistivity ρ ₁ [Ω · m] into the effective diffusion coefficient estimation formula, obtained chloride ions in the concrete to be evaluated. The effective diffusion coefficient of was estimated.

In this example, the volume resistivity measurement for obtaining the volume resistivity measurement value ρ ₁ [Ω · m] was performed using an alternating current as the applied current.

  Moreover, in order to verify the estimation accuracy by the above, the effective diffusion coefficient of the chloride ion was actually measured with respect to the concrete of the said evaluation object.

  In order to compare the estimated value of the effective diffusion coefficient of chloride ions with the measured value, the horizontal axis is “measured value” and the vertical axis is “value obtained by dividing the estimated value by the measured value (= estimated value / measured value). The combined data of the values corresponding to these two axes is plotted on the orthogonal axis, and the classification of the binder type is compared with the estimated value and the actual measurement value for the ordinary cement system. The result shown in Fig. 7 ((A) shows a comparison between the estimated value and the measured value for the mixed cement system. ) Shows no salt in the pore solution inside the concrete, and (B) shows salt).

  In FIGS. 6 and 7, if the value of “estimated value / actually measured value” on the vertical axis is 1, the estimated value and the actual measured value are equal. If plots are gathered in the vicinity, it can be said that the estimation accuracy is good. Note that the estimation result is excessive when the plot exists in a region where the value on the vertical axis is larger than 1, and the estimation result is excessive when the plot exists in a region where the value on the vertical axis is smaller than 1. There will be.

  Although the estimation result according to the present invention (specifically, the third embodiment) tends to be overestimated with respect to the actual measurement value (circle mark in FIGS. 6 and 7 is the estimation result according to the present invention), The average value of the estimated accuracy (= estimated value / actually measured value) is 1.08 to 1.22, and the estimated accuracy is much better than the estimated results in the past research examples (□ in each figure). It was confirmed.

  For example, in the “2007 Standard Specification for Concrete [Design]” (Japan Society of Civil Engineers, 2007), the verification of durability against salt damage in reinforced concrete structures confirms that steel corrosion does not occur due to the penetration of chloride ions. It is supposed to be done. In addition, the “2007 Standard Specification for Concrete [Maintenance and Management]” (Japan Society of Civil Engineers, 2007) predicts the diffusion of chloride ions in concrete for the maintenance of structures against salt damage. Has been. Thus, the apparent diffusion coefficient of chloride ions in concrete is an important physical property value in the evaluation of the chloride ion concentration distribution and the corrosion of steel in concrete structures, and the design, maintenance and management of concrete structures. It is one of the important physical property values in all scenes such as repairs, etc., and according to the concrete physical property value evaluation method of the present invention, the actual structure is damaged only by the input conditions that can be set realistically. Therefore, the effective diffusion coefficient of chloride ions in concrete can be estimated with high accuracy, so it has high utility value in fields such as material engineering, structural engineering, and design / maintenance of structures.

DESCRIPTION OF SYMBOLS 10 Concrete physical property evaluation apparatus 11 Control part 12 Storage part 13 Input part 14 Display part 15 Memory 16 Data server 17 Evaluation program of concrete physical property value 18 Measurement value database 19 Water content data file at the time of saturation

Claims (9)

The following formula 1

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Formulating the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state using respectively representing the power coefficient β, and the concrete volume in the fully saturated state step a, the water content of the concrete w _s and concrete water binder in the fully saturated condition for estimating the formulate performed by equation of the relationship between the resistivity [rho _s the effective diffusion coefficient D _e of chloride ions Formulate the relationship between the ratio and estimate the relationship, and measure the moisture content and volume resistivity of the concrete to be evaluated to measure the moisture content and the volume resistivity. The step of obtaining the combination data with the measurement value, and on the logarithmic axis from the combination data of the measurement value of the moisture content and the measurement value of the volume resistivity, the coefficient β of the power as the gradient of the change, The volume resistivity corresponding to the natural logarithm of the moisture content calculated by substituting the water binder ratio calculated in advance for the concrete to be priced into the relational expression between the moisture content and the water binder ratio W / B. by calculating the natural logarithm complete the steps of estimating the volume resistivity [rho _s in the saturation state, the estimated been completely the volume resistivity [rho _s in the saturation state and the volume resistivity of the effective diffusion of chloride ions evaluation of concrete physical properties characterized by having a step of estimating the effective diffusion coefficient D _e of chloride ions in the concrete in a completely saturated state are substituted into the relational expression between the coefficient. Equation 2 below

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Formulating the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state using respectively representing the power coefficient β, and the concrete volume in the fully saturated state step a, the water content of the concrete w _s and concrete water binder in the fully saturated condition for estimating the formulate performed by equation of the relationship between the resistivity [rho _s the effective diffusion coefficient D _e of chloride ions Formulating the relation between the ratio W / B and estimating the relation, and measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated to measure the moisture content w ₁ a method and for obtaining the measured value [rho ₁ of the volume resistivity, the fully hydrated volume resistivity [rho _s in relation between the volume resistivity at saturation [rho _s and effective diffusion coefficient D _e of chloride ions and the rate w _s and a volume resistivity ρ _s The following equation is a relationship between 3

Where w _s : moisture content of concrete in fully saturated state [%],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
β: Experimental constant
To equations obtained by substituting the relationship between the water content w _s and water binder ratio water content w _s in the formula and assignment with substitutes represent each of the evaluation of the concrete Substituting the measured value w _{1 of the} moisture content, the measured value ρ ₁ of the volume resistivity, and the value of the water binder ratio calculated in advance for the concrete to be evaluated, the effect of chloride ions of the concrete in a fully saturated state evaluation of concrete physical properties characterized by having a step of estimating the diffusion coefficient D _e. The step of calculating the water binder ratio W / B for the concrete to be evaluated and the measurement of the moisture content w ₁ and the volume resistance by measuring the moisture content and the volume resistivity of the concrete to be evaluated The step of obtaining the measured value ρ _{1 of the} rate, and the following equation 4

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm2 / year],
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
W / B: Concrete water binder ratio [%],
β, ε, γ, ζ, κ: coefficients (values shown in Table 1 are used)
Represents each

Substituting into the measured value w _{1 of the} moisture content of the concrete to be evaluated, the measured value ρ ₁ of the volume resistivity, and the water binder ratio of the concrete to be evaluated , the chloride ion of the concrete in a fully saturated state Estimating the effective diffusion coefficient _De of the concrete physical property value. Combination data of the measured value of the moisture content and the measured value of the volume resistivity obtained by measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated, and the above-mentioned concrete to be evaluated were calculated in advance. From the combination data of the means for reading the value of the water binder ratio from the internal storage device or the external storage device and the measured value of the moisture content and the measured value of the volume resistivity on the logarithmic axis,

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Is used to formulate the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state, and the power coefficient β estimated as the gradient of change in the fully saturated state The value of the water binder ratio calculated in advance for the concrete to be evaluated in the relational expression estimated by formulating the relationship between the moisture content w _s of the concrete and the water binder ratio W / B of the concrete Means for calculating the volume resistivity ρ _s in the fully saturated state by calculating the natural logarithm of the volume resistivity corresponding to the natural logarithm of the moisture content calculated by substituting, and the volume resistance of the concrete in the fully saturated state by substituting the volume resistivity [rho _s in the estimated been fully saturated state estimated by the equation performed formulate complete saturation of the relationship between the rate [rho _s the effective diffusion coefficient D _e of chloride ions Con in Evaluation device Concrete physical properties and having a means for estimating the effective diffusion coefficient D _e of Ried of chloride ions. About the combination data of the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity obtained by measuring the moisture content and the volume resistivity of the concrete to be evaluated, and the concrete to be evaluated Means for reading the value of the water binder ratio W / B calculated in advance from the internal storage device or the external storage device;

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Is used to formulate the relationship between the moisture content w _s of concrete in the fully saturated state and the volume resistivity ρ _s to estimate the power coefficient β, and the volume of the concrete in the fully saturated state water content w _s and water binder ratio W of the concrete of the concrete in a fully saturated state while estimating the formulate performed by equation of the relationship between the resistivity [rho _s the effective diffusion coefficient D _e of chloride ions / estimate relation performing formulate relationships between is B, and the volume resistivity in the relational expression between the effective diffusion coefficient D _e of the volume resistivity [rho _s with chloride ions [rho _s Is a relational expression between the water content w _s and the volume resistivity ρ _s in the following formula 7

Where w _s : moisture content of concrete in fully saturated state [%],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
β: Experimental constant
To equations obtained by substituting the relationship between the water content w _s and water binder ratio W / B water content w _s in the formula and assignment with substitutes represent respectively, the evaluation object The concrete chloride in a fully saturated state by substituting the measured value w _{1 of the} moisture content and the measured value ρ ₁ of the volume resistivity of the concrete and the value of the water binder ratio calculated in advance for the concrete to be evaluated And a means for estimating the effective diffusion coefficient _De of the concrete. About the combination data of the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity obtained by measuring the moisture content and the volume resistivity of the concrete to be evaluated, and the concrete to be evaluated Means for reading the value of the water binder ratio W / B calculated in advance from the internal storage device or the external storage device;

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm2 / year],
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
W / B: Concrete water binder ratio [%],
β, ε, γ, ζ, κ: coefficients (values shown in Table 2 are used)
Represents each

And substituting the measured water content w ₁ and the measured volume resistivity ρ ₁ of the concrete to be evaluated and the water binder ratio calculated in advance for the concrete to be evaluated . evaluation device concrete physical properties and having a means for estimating the effective diffusion coefficient D _e of chloride ions. Combination data of the measured value of the moisture content and the measured value of the volume resistivity obtained by measuring the moisture content and measuring the volume resistivity of the concrete to be evaluated, and the above-mentioned concrete to be evaluated were calculated in advance. From the combination data of the measured value of the moisture content and the measured value of the volume resistivity on the logarithmic axis on the means for reading the water binder ratio value from the internal storage device or the external storage device, the following formula 9

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Is used to formulate the relationship between the concrete moisture content w _s and the volume resistivity ρ _s in the fully saturated state, and the power coefficient β estimated as the gradient of change in the fully saturated state The value of the water binder ratio calculated in advance for the concrete to be evaluated in the relational expression estimated by formulating the relationship between the moisture content w _s of the concrete and the water binder ratio W / B of the concrete Is a means to calculate the volume resistivity by calculating the natural logarithm of volume resistivity corresponding to the natural logarithm of moisture content calculated by substituting, and the volume resistivity ρ _s of concrete in the fully saturated state and chloride ion estimating the effective diffusion coefficient D _e of chloride ions in the concrete in the by substituting the estimated volumetric resistivity in estimated relationships expression performed formulate complete saturation relationship between the effective diffusion coefficient De of You A program for evaluating physical properties of a concrete to allow a computer to function as a means. About the combination data of the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity obtained by measuring the moisture content and the volume resistivity of the concrete to be evaluated, and the concrete to be evaluated Means for reading the value of the water binder ratio calculated in advance from the internal storage device or the external storage device;

Where ρ _s : volume resistivity of concrete in a fully saturated state [Ω · m],
w _s : moisture content of concrete in fully saturated state [%],
α, β: Experimental constant
Is used to formulate the relationship between the moisture content w _s of concrete in the fully saturated state and the volume resistivity ρ _s to estimate the power coefficient β, and the volume of the concrete in the fully saturated state water content w _s and water binder ratio W of the concrete of the concrete in a fully saturated state while estimating the formulate performed by equation of the relationship between the resistivity [rho _s the effective diffusion coefficient D _e of chloride ions / estimate relation performing formulate relationships between is B, and the volume resistivity in the relational expression between the effective diffusion coefficient D _e of the volume resistivity [rho _s with chloride ions [rho _s The following formula 11 is a relational expression between the moisture content w _s and the volume resistivity ρ _s.

Where w _s : moisture content of concrete in fully saturated state [%],
ρ _s : Volume resistivity [Ω · m] of concrete in fully saturated state
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
β: Experimental constant
To equations obtained by substituting the relationship between the water content w _s and water binder ratio W / B water content w _s in the formula and assignment with substitutes represent respectively, the evaluation object The concrete chloride in a fully saturated state by substituting the measured value w _{1 of the} moisture content and the measured value ρ ₁ of the volume resistivity of the concrete and the value of the water binder ratio calculated in advance for the concrete to be evaluated evaluation program concrete physical properties for causing a computer to function as a means for estimating the effective diffusion coefficient D _e of the ion. About the combination data of the measured value w ₁ of the moisture content and the measured value ρ ₁ of the volume resistivity obtained by measuring the moisture content and the volume resistivity of the concrete to be evaluated, and the concrete to be evaluated Means for reading the value of the water binder ratio calculated in advance from the internal storage device or the external storage device,

Where _De : Effective diffusion coefficient of concrete chloride ion in fully saturated state
[Cm2 / year],
w ₁ : Measured value of moisture content of concrete [%]
ρ ₁ : Measured value of volume resistivity of concrete [Ω · m],
W / B: Concrete water binder ratio [%],
β, ε, γ, ζ, κ: coefficients (values shown in Table 3 are used)
Represents each

And substituting the measured water content w ₁ and the measured volume resistivity ρ ₁ of the concrete to be evaluated and the water binder ratio calculated in advance for the concrete to be evaluated . evaluation program concrete physical properties for causing a computer to function as a means for estimating the effective diffusion coefficient D _e of chloride ions.

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