New Measurements for the Resistivity of Curing Period Concrete

摘要

Resistivity measuring can be used as a nondestructive testing technique for concrete. Against the influences of residual potential caused by piezoelectric effect and polarization effect on resistivity measurements, presented a fast, accurate measurement for concrete specimen resistivity, which is, fix the specimens and the electrode plates with a jig, making the contact pressure in between weak, then conduct fast, electrode-switching measurements using digital multimeter, taking the average value as result to eliminate deviation introduced by residual potential. It avoids the trouble of more equipments and wiring of voltammetry, achieving a convenient, simple, fast and stable concrete resistivity testing process. A concrete cube specimen is made according to compressive strength test specification, on which compressive strength tests are conducted directly after resistivity measurements, facilitating the study of relations and rules between resistivity and compressive strength.