CN105717000A - Method for rapidly analyzing concrete chloride ion diffusion coefficient based on double control lines - Google Patents
Method for rapidly analyzing concrete chloride ion diffusion coefficient based on double control lines Download PDFInfo
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Abstract
The invention discloses a method for rapidly analyzing the concrete chloride ion diffusion coefficient based on double control lines.The method comprises the following steps: 1, judging the chloride ion diffusion control depth; 2, designing the double control lines and measuring the content of chloride ions; 3, calculating the concrete chloride ion diffusion coefficient.By means of the method, double control line design can be conducted on a concrete sample which conforms to diffusion control depth judgment, the concrete chloride ion diffusion coefficient is calculated quickly based on a concrete chloride ion diffusion coefficient calculating model containing the double control lines, and the method can be widely applied to durance analysis and service life research of concrete structures in chlorine salt environments such as the ocean and icing salt removal.
Description
One, technical field
The present invention relates to a kind of Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line, specifically chlorine ion binding capacity controlling depth is judged by one, and utilize the chloride diffusion coefficient computation model based on double control line, the method quickly calculating concrete chloride diffusion coefficient.
Two, background technology
There is durability damage gradually in the xoncrete structure in marine environment, leverage the service life of building structure owing to being subject to chloride erosion.Therefore, finding a kind of rapid analysis method about Chloride Diffusion Coefficient in Concrete is research and the key evaluating ocean concrete service life and durability.
The method of existing test chloride diffusion coefficient mainly has electric field acceleration test and natural immersion test.In electric field acceleration test method, chloride ion migrates into inside concrete with the electric field being carried in test specimen two ends for driving force, and for being truly exposed to the concrete in bar in chlorine salt solution, chloride ion is actually and diffuses into inside concrete with the chlorine ion concentration gradient inside and outside test specimen for driving force, therefore, electric field acceleration test cannot enter the process of inside concrete by chloride ion under accurate simulation real environmental conditions.In natural immersion is tested, although the process of chloride ion entrance inside concrete and practical situation are closely, but concrete graded layer pulverizing need to be sampled by the method, Fick's second law matching is utilized to obtain concrete chloride diffusion coefficient further according to the chlorine ion concentration at different depth place in concrete, test sample amount is big, needing when solving to be fitted analyzing, process is complicated, wastes time and energy.Therefore, how easy, fast and effeciently calculate concrete chloride diffusion coefficient, and carry out concrete structure durability and military service life search accordingly, there is important academic significance and future in engineering applications.
Three, summary of the invention
It is an object of the invention to provide a kind of Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line, the method can quickly calculate concrete chloride diffusion coefficient based on the concrete chloride ion coefficient calculations model of double control line, and the durability analysis for xoncrete structure provides a kind of succinct effective appraisal procedure.
The technical scheme is that a kind of Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line, comprise the steps:
1, chlorine ion binding capacity controlling depth judges: take out the concrete sample being exposed under bar in chlorine salt solution certain age by the one-dimensional diffusion of chloride ion, dry surface of test piece, along being perpendicular to, test specimen exposure direction is dry cuts test specimen, section is sprayed colored indicator, according to the colour developing concrete chlorine ion binding capacity controlling depth of situation analysis, when this degree of depth is be more than or equal to 12mm, it is qualified that chlorine ion binding capacity controlling depth is judged to, enter step 2, during such as this degree of depth less than 12mm, chlorine ion binding capacity controlling depth is judged to defective, exposure test need to be carried on, until the chlorine ion binding capacity controlling depth judgement of test specimen is qualified；
2, the design of double control line and chlorine ion content determination: the diffusion controlling depth according to concrete sample, test specimen section is drawn the first control line and the second control line, 3 to 6 sample points are designed respectively on every control line, then each sample point is carried out boring and take powder, by the sample point powder mix homogeneously on same control line and put in the baking oven that temperature is 60 DEG C and be dried to constant weight, the chloride ion that extracts on two control lines in sample powder respectively also measures free chloride ion content；
3, calculate Chloride Diffusion Coefficient in Concrete: the first control line recorded according to step 2 and the free chloride ion content at the second control line place, utilize the Chloride Diffusion Coefficient in Concrete computation model based on double control line to calculate concrete chloride diffusion coefficient.
It is 28 days to 50 years that described concrete sample is exposed to the age of bar in chlorine salt solution.
Described colored indicator is concentration is the silver nitrate solution of 0.10mol/L.
Described chlorine ion binding capacity controlling depth refers to after spraying colored indicator 15min, the boundary line average distance from test specimen exposure that develops the color of concrete cross section.
Described first control line is parallel with test specimen exposure, and with test specimen exposure distance be chlorine ion binding capacity controlling depth mark line, described second control line is parallel with test specimen exposure, and with the mark line that test specimen exposure distance is 1/2nd chlorine ion binding capacity controlling depths.
The described Chloride Diffusion Coefficient in Concrete computation model based on double control line is:
Wherein erfc () is Gaussian error cofunction；α is a constant, and numerical value isWherein d represents diffusion controlling depth, and unit is the exposure age that millimeter (mm), t represent concrete sample, and unit is year (a)；D represents chloride diffusion coefficient, and unit is mm2/ a；C1、C2Representing the first control line and the free chloride ion content at the second control line place respectively, unit is that chloride ion accounts for concrete mass percent %.
The present invention has the prominent advantages that:
There is provided a kind of based on the free chloride ion cubage Chloride Diffusion Coefficient in Concrete rapid analysis method on double control line first, the concrete sample meeting diffusion controlling depth judgement can be carried out double control line design, and the Chloride Diffusion Coefficient in Concrete computation model based on double control line quickly calculates concrete chloride diffusion coefficient, the durability of concrete structures under chloride environment is studied there is Important Academic meaning and engineer applied value.
Four, accompanying drawing explanation
Fig. 1 is the first control line and the second control line schematic diagram on concrete sample section.
Figure is labeled as: test specimen exposure 1, chlorine ion binding capacity contour line the 2, first control line the 3, second control line 4, chlorine ion binding capacity controlling depth d.
Fig. 2 analyzes result based on embodiment 1 to utilize business software ANSYS to solve the comparison diagram of free chloride ion content distribution situation and the double control line place free chloride ion content measured value obtained.
Fig. 3 analyzes result based on embodiment 2 to utilize business software ANSYS to solve the comparison diagram of free chloride ion content distribution situation and the double control line place free chloride ion content measured value obtained.
Five, detailed description of the invention
Below will the present invention is described in further detail by embodiment.
Embodiment 1
The present embodiment, as an instantiation of the Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line, comprises the following steps:
1, chlorine ion binding capacity controlling depth judges；
Comparison Fig. 1, take out the concrete sample being exposed under 56 day age of sodium chloride solution that mass percent concentration is 16.5% by the one-dimensional diffusion of chloride ion, dry surface of test piece, along being perpendicular to, test specimen exposure 1 direction is dry cuts test specimen, to the silver nitrate solution colored indicator that section spray concentration is 0.10mol/L, after indicator sprays 15min, diffusion profiles line 2 is described with anti-water-color paintbrush, 10 grades are divided to divide the boundary line distance from test specimen exposure that develops the color measuring concrete cross section, and calculate that to obtain colour developing boundary line be 25.2mm from the average distance of test specimen exposure, as chlorine ion binding capacity controlling depth d, owing to this degree of depth is more than 12mm, therefore chlorine ion binding capacity controlling depth be judged to qualified, enter step 2.
2. the design of double control line and chlorine ion content determination；
Comparison Fig. 1, diffusion controlling depth d according to concrete sample, section is drawn the first control line 3 and the second control line 4, first control line is parallel with test specimen exposure, and be chlorine ion binding capacity controlling depth, i.e. 25.2mm with test specimen exposure distance, the second control line is parallel with test specimen exposure, and be 1/2nd chlorine ion binding capacity controlling depth, i.e. 12.6mm with test specimen exposure distance；3 sample points are designed respectively on the first control line and the second control line, then each sample point is carried out boring and take powder, by the sample point powder mix homogeneously on same control line and put in the baking oven that temperature is 60 DEG C and be dried to constant weight, the chloride ion that extracts on two control lines in sample powder respectively also measures free chloride ion content, the free chloride ion content mass percent finally obtained on the first control line is 0.825%, and the free chloride ion content mass percent on the second control line is 0.09%.
3. calculate Chloride Diffusion Coefficient in Concrete；
The first control line recorded according to step 2 and the free chloride ion content at the second control line place, utilize the Chloride Diffusion Coefficient in Concrete computation model based on double control line to calculate concrete chloride diffusion coefficient:
Wherein erfc () is Gauss error function；α is a constant, and numerical value isWherein d represents diffusion controlling depth, and unit is the exposure age that millimeter (mm), t represent concrete sample, and unit is year (a)；D represents chloride diffusion coefficient, and unit is mm2/ a；C1、C2Representing the first control line and the free chloride ion content at the second control line place respectively, unit is % (chloride ion accounts for concrete mass percent).
Diffusion controlling depth d=25.2mm step 2 obtained and the mass percent of the free chloride ion content that mass percent is the 0.825%, second control line of the free chloride ion content of the first control line are 0.09%, open-assembly timeYear, substitute into the double control line computation model of chloride diffusion coefficient, then utilize computer software MathCAD to calculate and obtain Chloride Diffusion Coefficient in Concrete for D=441.9mm2/a。
Embodiment 2
The present embodiment, as another instantiation of the Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line, comprises the following steps:
The concrete sample by the one-dimensional diffusion of chloride ion is taken out from the middle part drill core of the concrete component 14 day age when being exposed to artificial seawater drying and watering cycle, dry surface of test piece, along being perpendicular to, test specimen exposure direction is dry cuts test specimen, to the silver nitrate solution colored indicator that section spray concentration is 0.10mol/L, after indicator sprays 15min, diffusion profiles line is described with anti-water-color paintbrush, 10 grades are divided to divide the boundary line distance from test specimen exposure that develops the color measuring concrete cross section, and calculate that to obtain colour developing boundary line be 10.6mm from the average distance of test specimen exposure, as chlorine ion binding capacity controlling depth d, owing to this degree of depth is less than 12mm, therefore need to carry on exposure test.Until during 60 day age, in the middle part of concrete component, another drill core takes out the concrete sample by the one-dimensional diffusion of chloride ion, dry surface of test piece, along being perpendicular to, test specimen exposure 1 direction is dry cuts test specimen, to the silver nitrate solution colored indicator that section spray concentration is 0.10mol/L, after indicator sprays 15min, diffusion profiles line is described with anti-water-color paintbrush, 10 grades are divided to divide the boundary line distance from test specimen exposure that develops the color measuring concrete cross section, and calculate that to obtain colour developing boundary line be 31.0mm from the average distance of test specimen exposure, as chlorine ion binding capacity controlling depth d, owing to this degree of depth is more than 12mm, therefore chlorine ion binding capacity controlling depth be judged to qualified, enter step 2.
2. the design of double control line and chlorine ion content determination；
Diffusion controlling depth d according to concrete sample, section is drawn the first control line and the second control line, first control line is parallel with test specimen exposure, and be chlorine ion binding capacity controlling depth with test specimen exposure distance, i.e. 31.0mm, second control line is parallel with test specimen exposure, and is 1/2nd chlorine ion binding capacity controlling depth, i.e. 15.5mm with test specimen exposure distance；4 sample points are designed respectively on the first control line and the second control line, then each sample point is carried out boring and take powder, by the sample point powder mix homogeneously on same control line and put in the baking oven that temperature is 60 DEG C and be dried to constant weight, the chloride ion that extracts on two control lines in sample powder respectively also measures free chloride ion content, the mass percent finally obtaining the free chloride ion content on the first control line is 0.623%, and the mass percent of the free chloride ion content on the second control line is 0.09%.
3. calculate Chloride Diffusion Coefficient in Concrete；
The first control line recorded according to step 2 and the free chloride ion content at the second control line place, utilize the Chloride Diffusion Coefficient in Concrete computation model based on double control line to calculate concrete chloride diffusion coefficient:
Wherein erfc () is Gauss error function；α is a constant, and numerical value isWherein d represents diffusion controlling depth, and unit is the exposure age that millimeter (mm), t represent concrete sample, and unit is year (a)；D represents chloride diffusion coefficient, and unit is mm2/ a；C1、C2Representing the first control line and the free chloride ion content at the second control line place respectively, unit is % (chloride ion accounts for concrete mass percent).
The diffusion controlling depth d=31.0mm that step 2 is obtained and the mass percent 0.09% of free chloride ion content of mass percent the 0.623%, second control line of the free chloride ion content of the first control line, open-assembly timeYear, substitute into the double control line computation model of chloride diffusion coefficient, then utilize computer software MathCAD to calculate and obtain Chloride Diffusion Coefficient in Concrete for D=734.1mm2/a。
Embodiment 3
The present embodiment is the instantiation of the effectiveness of checking the inventive method, namely analyze, according in embodiment 1 and embodiment 2, the chloride diffusion coefficient obtained, business numerical analysis software ANSYS is utilized to set up concrete chloride ion diffusion model, and solve the corresponding free chloride ion content distribution situation exposed during age in concrete, then test the free chloride ion content recorded contrast with embodiment 1 and embodiment 2:
Based on Fick second law, business numerical analysis software ANSYS is utilized to set up concrete chloride ion diffusion model.The Chloride Diffusion Coefficient in Concrete 441.9mm obtained is analyzed according to embodiment 12/ a, and measure the surface chlorine ion concentration 2.97% of concrete sample obtained, utilizes business numerical analysis software ANSYS to solve and obtains exposing age free chloride ion content distribution situation in concrete when being 56 days.
Fig. 2 be business numerical analysis software ANSYS solve obtain expose age tests the free chloride ion content at the first control line recorded and the second control line place when being 56 days comparison diagram in the free chloride ion content distribution situation in concrete and embodiment 1, in figure, curve shown in solid is free chloride ion content distribution value in the business numerical analysis software ANSYS concrete tried to achieve, and two shown in figure data point is the free chloride ion content measured value at double control line place in embodiment 1.As can be seen from Figure 2, use business numerical analysis software ANSYS calculated double control line place free chloride ion content value and practical measurement value substantially identical, illustrate that it is rational for using the chloride diffusion coefficient of concrete sample that the inventive method analysis obtains, and demonstrates the effectiveness of the inventive method.
Based on Fick second law, business numerical analysis software ANSYS is utilized to set up concrete chloride ion diffusion model.The Chloride Diffusion Coefficient in Concrete 734.1mm obtained is analyzed according to embodiment 22/ a, and measure the surface chlorine ion concentration 1.93% of concrete sample obtained, utilizes business numerical analysis software ANSYS to solve and obtains exposing age free chloride ion content distribution situation in concrete when being 60 days.
Fig. 3 be business numerical analysis software ANSYS solve obtain expose age tests the free chloride ion content at the first control line recorded and the second control line place when being 60 days comparison diagram in the free chloride ion content distribution situation in concrete and embodiment 2, in figure, curve shown in solid is free chloride ion content distribution value in the business numerical analysis software ANSYS concrete tried to achieve, and two shown in figure data point is the free chloride ion content measured value at double control line place in embodiment 2.As can be seen from Figure 3, use business numerical analysis software ANSYS calculated double control line place free chloride ion content value and practical measurement value substantially identical, illustrate that it is rational for using the chloride diffusion coefficient of concrete sample that the inventive method analysis obtains, and demonstrates the effectiveness of the inventive method further.
Claims (6)
1. the Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line, it is characterised in that comprise the following steps:
(1) chlorine ion binding capacity controlling depth judges: take out the concrete sample being exposed under bar in chlorine salt solution certain age by the one-dimensional diffusion of chloride ion, dry surface of test piece, along being perpendicular to, test specimen exposure direction is dry cuts test specimen, section is sprayed colored indicator, according to the colour developing concrete chlorine ion binding capacity controlling depth of situation analysis, when this degree of depth is be more than or equal to 12mm, it is qualified that chlorine ion binding capacity controlling depth is judged to, enter step (2), during such as this degree of depth less than 12mm, chlorine ion binding capacity controlling depth is judged to defective, exposure test need to be carried on, until the chlorine ion binding capacity controlling depth judgement of test specimen is qualified；
(2) design of double control line and chlorine ion content determination: the diffusion controlling depth according to concrete sample, test specimen section is drawn the first control line and the second control line, 3 to 6 sample points are designed respectively on every control line, then each sample point is carried out boring and take powder, by the sample point powder mix homogeneously on same control line and put in the baking oven that temperature is 60 DEG C and be dried to constant weight, the chloride ion that extracts on two control lines in sample powder respectively also measures free chloride ion content；
(3) calculate Chloride Diffusion Coefficient in Concrete: the first control line recorded according to step (2) and the free chloride ion content at the second control line place, utilize the Chloride Diffusion Coefficient in Concrete computation model based on double control line to calculate concrete chloride diffusion coefficient.
2. the Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line according to claim 1, it is characterised in that it is 28 days to 50 years that described concrete sample is exposed to the age of bar in chlorine salt solution.
3. the Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line according to claim 1, it is characterised in that described colored indicator is the silver nitrate solution of 0.10mol/L.
4. the Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line according to claim 1, it is characterized in that, described chlorine ion binding capacity controlling depth refers to after spraying colored indicator 15min, the boundary line average distance from test specimen exposure that develops the color of concrete cross section.
5. according to the Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line described in claim 1, it is characterized in that, described first control line is parallel with test specimen exposure, and with test specimen exposure distance be chlorine ion binding capacity controlling depth mark line, described second control line is parallel with test specimen exposure, and with the mark line that test specimen exposure distance is 1/2nd chlorine ion binding capacity controlling depths.
6. the Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line according to claim 1, it is characterised in that the described Chloride Diffusion Coefficient in Concrete computation model based on double control line is:
Wherein erfc () is Gaussian error cofunction；α is a constant, and numerical value isWherein d represents diffusion controlling depth, and unit is the exposure age that millimeter (mm), t represent concrete sample, and unit is year (a)；D represents chloride diffusion coefficient, and unit is mm2/ a；C1、C2Representing the first control line and the free chloride ion content at the second control line place respectively, unit is mass percent %.
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| CN107192640A (en) * | 2017-07-12 | 2017-09-22 | 广西路桥工程集团有限公司 | Concrete soak test device |
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| CN106970207A (en) * | 2017-03-02 | 2017-07-21 | 西安交通大学 | A kind of method of the Chloride Ion in Concrete diffusion analysis based on meso-mechanical model |
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Application publication date: 20160629 Assignee: Guangxi Baotian environmental protection materials Co.,Ltd. Assignor: GUANGXI University Contract record no.: X2022450000295 Denomination of invention: Fast analysis method of chloride diffusion coefficient of concrete based on double control lines Granted publication date: 20180316 License type: Common License Record date: 20221214 |
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