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Method and system for non-contact electrical resistivity-based evaluation of permeability of cement-based material

A cement-based material, non-contact technology, applied in the direction of permeability/surface area analysis, suspension and porous material analysis, measurement devices, etc., can solve the problems of long test time, affecting test results, large test errors, etc., and achieve test results The effect of short cycle, low test cost and simple preparation

Inactive Publication Date: 2013-08-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, direct application of current to concrete specimens may generate heat inside the concrete and affect test results
If the concrete has low permeability, the test time will be longer. If the current is applied for too long, the concrete hydration product will be electrolyzed, causing the ion concentration of the concrete pore solution to change, resulting in a large test error.
The technical principles and testing methods of the above-mentioned test methods have various defects, and it is difficult to efficiently, objectively and accurately characterize the permeability of concrete, which makes it difficult to reasonably evaluate the durability of concrete at present.

Method used

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  • Method and system for non-contact electrical resistivity-based evaluation of permeability of cement-based material
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  • Method and system for non-contact electrical resistivity-based evaluation of permeability of cement-based material

Examples

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Effect test

Embodiment example 1

[0045] The detection method of the present invention is used to investigate the permeability of cement slurry. The non-contact resistivity tester used is the CCR2 tester produced by Zhongheng Gangke (Shenzhen) Technology Co., Ltd. The water-cement ratio of the cement paste is 0.60, and the curing period is 7 days. Two test pieces are used for each group of cement slurry, the arc angle of the test piece is π / 2, the concentration of sodium chloride solution is 1mol / L, and the sampling frequency is 0.167Hz. Among them, the cement is P·O 52.5 grade ordinary Portland cement produced by Hubei Huaxin Cement Factory, with a specific surface area of ​​350 m 2 / kg; water is tap water. The test results of resistivity mutation time and permeability rate of cement paste samples are shown in Table 1.

[0046] Table 1 Test results of cement slurry penetration rate

[0047] Sample serial number Resistivity mutation time T (s) Permeation rate V (10 -6 m / s) 1 12006 4.00...

Embodiment example 2

[0050] The detection method of the present invention is used to investigate the permeability of cement slurry. The non-contact resistivity tester used is the CCR2 tester produced by Zhongheng Gangke (Shenzhen) Technology Co., Ltd. The water-cement ratio of the cement slurry is 0.60, 0.53 and 0.45 respectively, and the curing period is 28 days. Two test pieces are used for each group of cement slurry, the arc angle of the test piece is π / 2, the concentration of sodium chloride solution is 1mol / L, and the sampling frequency is 0.167Hz. Among them, the cement is P·O 52.5 grade ordinary Portland cement produced by Hubei Huaxin Cement Factory, with a specific surface area of ​​350 m 2 / kg; water is tap water. The test results of resistivity mutation time and permeability rate of cement paste samples can be seen in Table 2.

[0051] Table 2 Resistivity mutation time and permeability performance of cement slurry with different water-cement ratios

[0052]

[0053] Table 2 show...

Embodiment example 3

[0055] The detection method of the present invention is used to investigate the permeability of concrete. The non-contact resistivity tester used is the CCR2 tester produced by Zhongheng Gangke (Shenzhen) Technology Co., Ltd. The mix ratio of concrete can be seen in Table 3, and the penetration rates of concrete 12h, 18h, 1d, 2d, 3d, 7d, 14d and 28d were tested respectively. Two test pieces are used for each group of cement slurry, the arc angle of the test piece is π / 2, the concentration of sodium chloride solution is 1mol / L, and the sampling frequency is 0.167Hz. Among them, the cement is P·O 52.5 grade ordinary Portland cement produced by Hubei Huaxin Cement Factory, with a specific surface area of ​​350 m 2 / kg; river sand is used as fine aggregate, and the fineness modulus is 2.5-2.6; coarse aggregate is crushed stone with continuous grading of 5-20 mm; tap water is used as water. The test results of resistivity mutation time and permeability rate of cement slurry sampl...

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Abstract

The invention relates to a building material detection technology and provides a method and a system for non-contact electrical resistivity-based evaluation of permeability of a cement-based material. The system comprises two semicircular groove molds with covers. The semicircular groove molds pass through two coils of a non-contact electrical resistivity tester and then are butt-jointed, and the butt-joint is sealed tightly by glass cement so that solution leakage is prevented. Two test samples of which a part of circumference is circular compose a group. The test samples are put into the semicircular groove molds. Vaseline is coated between inner walls of the semicircular groove molds and the surfaces of the test samples close to test sample ends and is used for preventing direct permeation of the solution. A common salt solution is poured into the semicircular groove molds and the level height of the common salt solution in the semicircular groove molds is equal to that of the test samples. The method and the system can overcome defects of the prior art, and realize objective, accurate and reasonable evaluation of permeability of a cement-based material. The method has the advantages of simple sample preparation processes, simple operation, short test period and low test cost.

Description

technical field [0001] The invention belongs to the technical field of building material detection, and in particular relates to a method for evaluating the permeability of cement-based materials based on non-contact resistivity. Background technique [0002] Cement-based materials are one of the most commonly used construction materials in modern civil engineering. Improving the service performance and durability of cement-based materials is of great significance to improving the service life of building structures. At present, the theoretical and experimental research on the durability of cement-based materials has become a hot spot in civil engineering research. Studies have shown that the permeability and durability of cement-based materials are closely related. This is mainly because the permeability of cement-based materials determines the difficulty of gas, liquid and various aggressive ions invading into the interior of cement-based materials. Cement-based materia...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 田野陈军金南国金贤玉
Owner ZHEJIANG UNIV
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