Correction of chloride diffusion coefficient derived from RCM test based on the electrical conductiv

• 作 者: PinhaiGao;TongshengZhang;JieHu;JiangxiongWei;QijunYu;
• 出 处: The 14th International Congress on the Chemistry of Cement (
• 发表日期: 2015年期

The chloride permeability of concrete is mainly depended on the transport properties of concrete, while the result of rapid chloride migration (RCM) test, which is virtually measurement of electrical conductivity of concrete, is not only influenced by the transport properties of concrete but also by the electrical conductivity of pore solution.Therefore, utilization of RCM method to evaluate the chloride permeability of concretes is not so accurate.In the present study, the electrical conductivity of pore solution of concretes with supplementary cementitious materials was normalized relative to that of Portland cement concrete, then the chloride diffusion coefficient derived from RCM test was corrected to minimize the influence of electrical conductivity of pore solution.The corrected chloride diffusion coefficient was much closer correlated to the transport properties (in terms of capillary water absorption rate and capillary porosity) of concretes, indicating that corrected of chloride diffusion coefficient can be regarded as a more reliable and effective index to evaluate the chloride permeability of concretes.