关键词: 水工混凝土, 无损检测, 高密度电法, 电极排列, 分辨率

Abstract: The resistivity of hydraulic concrete with internal defects shows local high and low resistance anomalies. It is the key of high-density electrical nondestructive tests to enhance the identification resolution of high and low resistance zones through different electrode arrangements. An experimental study is conducted using three electrode arrangements of α, β and γ to explore the identification resolution of resistance abnormal bodies, by simulating the abnormal bodies in the concrete with materials of similar high and low resistance. The test results show that the abnormal body specimens from high to low resolution are ranked as α > β > γ for high resistance, γ > β > α for low resistance, and β > α > γ for high-low resistance. This means that the arrangement α is better for the concrete defects of holes and cavities, γ better for those of leakage, and β for those of holes, cavities, leakage, etc. The results help promote the application of high-density electrical methods in the nondestructive tests of hydraulic concrete.

Key words: hydraulic concrete, non-destructive testing, high-density resistivity method, electrode arrangement, resolution