Application of the Resistivity in Quality Control of Concrete Durability for the Hong Kongâ•fiZhuhaiâ•fiMacao Bridge

Engineering uses the chloride ion diffusion coefficient as the durability of concrete quality control indicators under the marine environment, due to the chloride ion diffusion coefficient and the electrical resistivity of concrete parameters are reflected in the concrete pore structure, and resistivity testing is convenient, fast advantages, the resistivity alternative chloride ion diffusion coefficient for the durability of concrete quality control has practical significance. In this paper, using concrete mix of the immersed tube tunnel in Hong Kong–Zhuhai–Macao Bridge as research object, Under the standard curing conditions (temperature 20±2°C, 95% RH or more), Through the different ages of the specimen tested, Wenner method resistivity test results are more stable than the RCM chloride diffusion coefficient of the test results. Building the relationships between resistivity and chloride diffusion coefficient, and resistivity tests the specimen which is the entire structure of retention, compared with the result of the actual measured RCM method of chloride diffusion coefficient, average value of the diffusion coefficient what is concluded by resistivity is higher than real one, using the resistivity for the durability of control indicators is conservative, more demanding of the quality of concrete materials. Therefore, using resistivity as index to monitor changes of the materials is possible.