A Method for Accurately Measuring Concrete Resistivity by Eliminating Residual Potential

A residual potential and resistivity technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., to achieve the effect of eliminating piezoelectric potential and polarization potential, ensuring accuracy, and eliminating the influence of measurement results

Inactive Publication Date: 2017-02-08
营口富里泥炭科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the problem that the residual potential caused by the piezoelectric effect and the polarization effect affects the measurement result of the resistivity, the invention provides a method for accurately measuring the concrete resistivity by eliminating the residual potential

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  • A Method for Accurately Measuring Concrete Resistivity by Eliminating Residual Potential

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Embodiment Construction

[0032] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0033] Selection of test materials:

[0034] Cement: The cement used in the test is ordinary Portland cement, model P.O42.5R. Fine aggregate: In order to ensure the benchmark concrete performance, standard sand is used; the sea sand is collected from the sea area near Dalian, the fineness modulus is 2.65, and the Cl in the sea sand is - Mass content 0.68%, Cl after washing - The mass content is less than 0.03%. Coarse aggregate: the apparent density of the stone used in the test is 2850kg / m 3 , the maximum particle size is 25mm, and it comes from limestone mines around Dalian. Water: tap water and raw water for making alkaline activated water are tap water in Dalian University of Technology.

[0035] The concrete mix in this test is shown in Table 1.

[0036] Table 1 Reference concrete mix ratio (W / C=0.45)

[0037] Compositi...

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Abstract

The invention provides a method for eliminating the rest potential to accurately measure the concrete specific resistance, and belongs to the technical field of concrete testing analysis. The method includes the steps that a first auxiliary pole plate, a first plate electrode, a first to-be-tested concrete test piece, a second plate electrode, a second auxiliary pole plate and a second to-be-tested concrete test piece are sequentially stacked on a common smooth experiment table top, slight contact pressure is exerted, the resistance of the test piece between the two plate electrodes is rapidly measured two times through a digital multimeter in the mode of switching electrodes, and the results of the two times of measurement are averaged. By means of the method, influences of the rest potential caused by the piezoelectric effect and the polarization effect on the specific resistance measurement results can be eliminated, the specific resistance development law and the relation and the development law between the specific resistance and the compressive strength in the maintenance period are conveniently researched, and the specific resistance of the concrete test pieces is easily, conveniently, rapidly, accurately and stably tested.

Description

technical field [0001] The invention belongs to the technical field of concrete testing and analysis, in particular to a method for accurately measuring concrete resistivity by eliminating residual potential. Background technique [0002] Concrete resistivity can comprehensively reflect the saturation rate of concrete capillary pores, concrete pore structure, porosity, and pore liquid ion concentration, so it is a very important electrical parameter. Factors that affect the resistivity of concrete include cement type, curing conditions, water-binder ratio, degree of hydration, relative humidity, aggregate volume fraction, etc. The resistivity of cement slurry is generally much smaller than that of aggregate, so from the perspective of conductivity, concrete can be regarded as a composite material in which aggregate insulators are embedded in the conductive matrix of cement slurry. In the cement slurry conductor, the conductive liquid phase is its conductive medium, and unhy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01N27/04G01N1/34
Inventor 孙炳全鲁昌国张丹孙佳佳王笑竹闵月月
Owner 营口富里泥炭科技有限公司
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