CN106908489A - A kind of non-destructive determination method of grinding coagulation soil moisture content - Google Patents
A kind of non-destructive determination method of grinding coagulation soil moisture content Download PDFInfo
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- CN106908489A CN106908489A CN201710102176.1A CN201710102176A CN106908489A CN 106908489 A CN106908489 A CN 106908489A CN 201710102176 A CN201710102176 A CN 201710102176A CN 106908489 A CN106908489 A CN 106908489A
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- moisture content
- coagulation soil
- dielectric constant
- grinding coagulation
- concrete
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
Abstract
The invention discloses a kind of non-destructive determination method of grinding coagulation soil moisture content, methods described is the dielectric constant that the upper layer of grinding coagulation soil is obtained by ELECTROMAGNETIC REFLECTION intensity, then obtains moisture content by dielectric constant calculating.Compared with prior art, the present invention has advantages below：(1) present invention measures levels grinding coagulation soil surface reflected intensity based on ground penetrating radar exploration, levels concrete dielectric constant is calibrated by reflected intensity again, levels concrete moisture content is finally gone out by Monte Carlo Simulation, the method has quick, accurate feature, and at utmost grinding concrete construction quality can be controlled comprehensively；(2) assay method high working efficiency of the present invention, high resolution, it is lossless the advantages of.
Description
Technical field
The invention belongs to hydro-structure detection technique field, it is related to a kind of assay method of grinding coagulation soil moisture content, especially
It is related to a kind of nondestructive rapid determining method of the grinding coagulation soil moisture content based on ground penetrating radar exploration.
Background technology
Grinding coagulation soil uses water, cement, admixture, additive, fine aggregate as a kind of poor cement concrete of dry
With the coarse aggregate mixing of grading control into the dry concrete without slump, it is mainly used in pouring into a mould concrete dam.Grinding coagulation
Soil not only have dam body small volume, intensity is high, self-defence performance is good, can overflow the features such as, and with operational procedure it is simple, quick,
Advantage economic, that large-scale general machinery can be used.
Grinding coagulation soil is a kind of important construction material of concrete dam, and the construction quality of grinding coagulation soil is to dam
Performance plays vital effect, and a critical problem of water conservancy project technology is turned into quality control on construction, and concrete is aqueous
Rate has a significant impact to its material property, and particularly concrete moisture content produces material impact, grinding coagulation soil to Coating combination
Moisture content is an important indicator for identifying construction quality.Therefore, how fast and accurately to determine grinding coagulation soil moisture content into
It is technical problem urgently to be resolved hurrily.
Traditional assay method such as direct sample drying of grinding coagulation soil moisture content, traditional sampling drying method investigation is ground
Pressure concrete moisture content has work period long, high cost, destructive big and detection is discontinuous, has a strong impact on construction speed.
For being used to determine grinding coagulation soil moisture content in the grinding coagulation most common Nucleus Density Apparatus of soil, nuclear device not only has to be put
Radioactive pollution drawback, and the detection method operating efficiency is relatively low.
The content of the invention
The technical problem of solution：In order to overcome the defect of prior art, improve to grinding coagulation soil measurement of water-content coefficient technology
Level, the adaptability and reliability of Enhancement Method, the invention provides a kind of non-destructive determination method of grinding coagulation soil moisture content.
Technical scheme：A kind of non-destructive determination method of grinding coagulation soil moisture content, methods described is strong by ELECTROMAGNETIC REFLECTION
Degree obtains the dielectric constant of the upper layer of grinding coagulation soil, then obtains moisture content by dielectric constant calculating；Wherein, dielectric constant with
The relational expression of moisture content is：
In formula (1),It is moisture content, ε is dielectric constant, b, a1, a2, a3It is coefficient, it is true according to different concrete mixs
It is fixed.
Preferably, the reflected intensity is with the relational expression of dielectric constant：
In formula (2), A0It is grinding coagulation soil surface reflected intensity, AsIt is iron plate surface reflected intensity, ε is dielectric constant.
Preferably, the reflected intensity is determined by GPR.
Preferably, the ELECTROMAGNETIC REFLECTION be by sensor and concrete interface distance, using air and concrete it
Between form interface and the reflection realized.
Beneficial effect：(1) present invention measures levels grinding coagulation soil surface reflected intensity based on ground penetrating radar exploration, then
Levels concrete dielectric constant is calibrated by reflected intensity, levels concrete moisture content is finally gone out by Monte Carlo Simulation,
The method has quick, accurate feature, and at utmost grinding concrete construction quality can be controlled comprehensively；(2) present invention
The assay method high working efficiency, high resolution, it is lossless the advantages of.
Brief description of the drawings
Fig. 1 is the flow chart of the non-destructive determination method of grinding coagulation soil moisture content of the present invention；
Fig. 2 is the schematic diagram that GPR of the present invention determines grinding coagulation soil dielectric constant.
Specific embodiment
Following examples further illustrate present disclosure, but should not be construed as limiting the invention.Without departing substantially from
In the case of spirit of the invention and essence, the modification and replacement made to the inventive method, step or condition belong to the present invention
Scope.If not specializing, the conventional meanses that technological means used is well known to those skilled in the art in embodiment.
Embodiment 1
The non-destructive determination flow of the grinding coagulation soil moisture content described in the present embodiment as shown in figure 1, specific assay method such as
Under：
The dielectric constant of the upper layer of grinding coagulation soil is obtained by ELECTROMAGNETIC REFLECTION intensity, then acquisition is calculated by dielectric constant
Moisture content；Wherein, dielectric constant is with the relational expression of moisture content：
In formula (1),It is moisture content, ε is dielectric constant, b, a1, a2, a3It is coefficient, it is true according to different concrete mixs
It is fixed.
The reflected intensity is with the relational expression of dielectric constant：
In formula (2), A0It is grinding coagulation soil surface reflected intensity, AsIt is iron plate surface reflected intensity, ε is dielectric constant.
As shown in Fig. 2 the present embodiment determines grinding coagulation soil dielectric constant using ground penetrating radar exploration, specific steps are such as
Under：
(1) first it is, using iron plate reflected intensity as reference, GPR to be placed in grinding coagulation soil continuous mode
Directly over iron plate, and level altitude H, measure reflected intensity of the iron plate to Gpr Signal；
(2) in measuring lower-layer concrete, GPR is positioned over directly over measuring point, is highly fixed value H, under measure
Layer concrete GPR reflected intensity；
(3) upper strata pouring out concrete and after closing a position, it is ensured that measurement is certain smooth, identical with step (2), determines upper strata
GPR reflected intensity；
The determination step of concrete moisture content and dielectric constant relational expression：
(1) according to actual grinding concrete construction scene, the match ratio of concrete is determined；
(2) according to above-mentioned match ratio and concrete water-cut variation scope, mix goes out several groups of differences in laboratory conditions
The concrete of moisture content；
(3) concrete dielectric constant under different water cut state is measured using GPR, fits in formula (1) and be
Number.
Claims (4)
1. the non-destructive determination method of a kind of grinding coagulation soil moisture content, it is characterised in that methods described is strong by ELECTROMAGNETIC REFLECTION
Degree obtains the dielectric constant of the upper layer of grinding coagulation soil, then obtains moisture content by dielectric constant calculating；Wherein, dielectric constant with
The relational expression of moisture content is：
θ=b+a1·ε+a2·ε2+a3·ε3 (1)
In formula (1), θ is moisture content, and ε is dielectric constant, b, a1, a2, a3It is coefficient, is determined according to different concrete mixs.
2. the non-destructive determination method of a kind of grinding coagulation soil moisture content according to claim 1, it is characterised in that described anti-
Penetrate intensity is with the relational expression of dielectric constant：
In formula (2), A0It is grinding coagulation soil surface reflected intensity, AsIt is iron plate surface reflected intensity, ε is dielectric constant.
3. the non-destructive determination method of a kind of grinding coagulation soil moisture content according to claim 1, it is characterised in that described anti-
Intensity is penetrated to be determined by GPR.
4. a kind of non-destructive determination method of grinding coagulation soil moisture content according to claim 1, it is characterised in that the electricity
Magnetoreflection is that, by sensor and concrete interface distance, that is realized using interface is formed between air and concrete is anti-
Penetrate.
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| CN201710102176.1A CN106908489A (en) | 2017-02-24 | 2017-02-24 | A kind of non-destructive determination method of grinding coagulation soil moisture content |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333096A (en) * | 2018-03-28 | 2018-07-27 | 东南大学 | A kind of asphalt concrete pavement porosity detection method based on Ground Penetrating Radar |
| CN110058227A (en) * | 2019-05-28 | 2019-07-26 | 石家庄铁道大学 | A kind of plain concrete coarse aggregate automatic testing method based on Ground Penetrating Radar |
| CN110715963A (en) * | 2019-07-16 | 2020-01-21 | 武汉大学 | Method for detecting ice content of concrete |
| CN111650088A (en) * | 2020-06-10 | 2020-09-11 | 河海大学 | Real-time detection method for rheological property of fluid concrete mixture |
| CN112130595A (en) * | 2020-09-23 | 2020-12-25 | 四川鼎德商品混凝土有限公司 | Control method and system for mixing ratio of concrete raw materials and storage medium |
| CN113447538A (en) * | 2021-08-13 | 2021-09-28 | 重庆大学 | Common concrete compressive strength capacitance nondestructive testing method |
| CN114459954A (en) * | 2022-01-11 | 2022-05-10 | 同济大学 | Ground penetrating radar-based concrete setting time monitoring method, device and medium |
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| CN103926259A (en) * | 2014-01-28 | 2014-07-16 | 河海大学 | Ground penetrating radar based concrete maturity prediction model |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333096A (en) * | 2018-03-28 | 2018-07-27 | 东南大学 | A kind of asphalt concrete pavement porosity detection method based on Ground Penetrating Radar |
| CN110058227A (en) * | 2019-05-28 | 2019-07-26 | 石家庄铁道大学 | A kind of plain concrete coarse aggregate automatic testing method based on Ground Penetrating Radar |
| CN110058227B (en) * | 2019-05-28 | 2023-03-17 | 石家庄铁道大学 | Ground penetrating radar-based automatic detection method for coarse aggregate of plain concrete |
| CN110715963A (en) * | 2019-07-16 | 2020-01-21 | 武汉大学 | Method for detecting ice content of concrete |
| CN111650088A (en) * | 2020-06-10 | 2020-09-11 | 河海大学 | Real-time detection method for rheological property of fluid concrete mixture |
| CN112130595A (en) * | 2020-09-23 | 2020-12-25 | 四川鼎德商品混凝土有限公司 | Control method and system for mixing ratio of concrete raw materials and storage medium |
| CN112130595B (en) * | 2020-09-23 | 2022-09-20 | 四川鼎德商品混凝土有限公司 | Control method and system for mixing ratio of concrete raw materials and storage medium |
| CN113447538A (en) * | 2021-08-13 | 2021-09-28 | 重庆大学 | Common concrete compressive strength capacitance nondestructive testing method |
| CN114459954A (en) * | 2022-01-11 | 2022-05-10 | 同济大学 | Ground penetrating radar-based concrete setting time monitoring method, device and medium |
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