Method for measuring volume resistance rate of conductive cement base material

Abstract

This invention relates to the civil engineering materials field, which is a method of testing volume resistivity of conductive cement-based materials. The method tests sample voltammetric with four electrodes based on principle of resistance first, and calculate the resistivity values of the sample based on the formula. With the following steps: 1) select the cement-based material samples, and take the pretreatments; 2) take two ends of the testing sample as current access electrode, and two middle parallel surfaces of the sample as voltage test electrodes, and link current into the test; 3) measure resistance based on Principle V and calculate the corresponding resistivity value. The invention takes the entire face of the sample as current access electrode; and central surface electrode as voltage test electrode. Save the tedious process of ordinary electrode testing method embedding electrodes and dispel the one-sidedness of ordinary electrode voltage testing. Test the voltage drop of the sample voltage electrode more accurately.

Description

Technical field [0001] The invention relates to the technical field of civil engineering materials, in particular to a method for accurately measuring the volume resistance or resistivity of conductive cement-based materials. Background technique [0002] Conductive cement-based materials, such as conductive cement stone, conductive mortar, conductive concrete, etc., are new functional materials prepared by incorporating conductive substances (carbon fiber, carbon black, steel fiber, conductive polymer). Carbon fiber cement-based materials are the most widely researched and applied conductive cement-based materials. Conductive cement-based materials have many unique functions, such as self-induced stress, strain, temperature and thermoelectric effects, as well as temperature and deformation self-regulation. The ideal conductive cement-based material must have good and stable electrical properties. However, due to the complexity of the internal conduction mechanism of conductive c...

AI Technical Summary

Problems solved by technology

Because there are a large number of conductive ions inside the cement material, they will move directionally under the action of the electric field, resulting in a polarization effect, and the error is large when using the bipolar method; while the ordinary quadrupole method must be pre-embedded in the cement-based material. Four electrodes, different electrode positions and sizes have large differences in the final test results (the error exceeds 10%), it is difficult to accurately measure and evaluate the true resistivity of conductive cement-based materials

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