Measurement method of concrete resistivity and device thereof

Abstract

The invention discloses a measurement method of concrete resistivity and a device thereof. The measurement method comprises the following steps: a. arranging an electrode respectively at two ends of the concrete to be detected; b. applying direct current of a steady state value between the above two electrodes, measuring the electric potential between the electrodes and recording as energization electric potential; c. disconnecting the direct current applied on the electrodes, measuring the electric potential between electrodes in short enough time and recording as interruption electric potential; d. changing the value of the applied direct current value of a steady state value, repeating the steps of b and c for 0 to 50 times; and e. calculating the concrete resistivity according to the energization electric potential and the interruption electric potential measured in the above steps. The measurement method and device can directly measure the concrete resistivity without destroying the surface structure of the concrete to be detected, the measuring result is stable, the measurement method is rapid and accurate and the measuring instrument is easy to operate.

Description

technical field [0001] The invention relates to a resistivity measuring method and a measuring device used therefor, in particular to a concrete resistivity measuring method and a device thereof. Background technique [0002] The conductivity of hardened concrete is an electrolytic process that occurs when ions flow in the concrete pore fluid. The magnitude of the resistivity depends on the chloride content in the concrete, the moisture content and temperature in the pore structure of the concrete and other factors. [0003] (1) Chloride. Chloride in concrete will seriously affect the resistivity of concrete whether it is brought in congenitally or infiltrated the day after tomorrow. The higher the chloride content, the lower the concrete resistivity, and the lower the chloride content, the higher the concrete resistivity. [0004] (2) The water content in the concrete mesopore structure also has a considerable influence on the resistivity. Concrete is almost non-conducti...

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Problems solved by technology

[0015] (1) Four-electrode method, the principle is alternating current technology, this method is widely used in the measurement of soil resistivity, but since the four electrode heads need to be inserted into the concrete during the measurement process, it is necessary to punch 4 electrodes on the concrete surface before the test. Insert the small holes of the four electrode heads (the appropriate hole depth is closely related to the measurement accuracy), and it can be measured without drilling, but the measurement accuracy will be significantly affected

Therefore, the application of this method in the measurement of concrete resistivity is limited and it is widely used in soil.

(2) The two-electrode method is a simplification of the four-electrode method. The principle is also the alternating current technology, and holes need to be drilled before the test; because the measurement accuracy is worse than the four-electrode method, there are no products on the market now.

[0016] (3) Single-electrode method, the principle is direct current technology, but there is only one electrode. Since the steel bars in the concrete act as another test electrode, the concrete without steel bars cannot be tested. In addition, although there is no need to drill holes in the concrete surface, concrete is required. Only when the steel bars in the wire are exposed can the measurement electrical circuit be formed

This method has the worst accuracy, so it is usually only one of the qualitative experimental measurement methods, and cannot become a commercial product

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