STUDY ON CHECK EXPERIMENT OF MEASUREMENT METHODS FOR CHLORIDE DIFFUSION COEFFICIENT OF CONCRETE

Using the alternating current bridge method and the NEL method and the natural diffusion method,the check experiments for chloride diffusion of ordinary hydraulic concrete with five mix proportions are tested.Based on the tested and calculated chloride diffusion coefficients,the correlation coefficients of chloride diffusion coefficients with the water cement ratios and porosity and compressive strengths of test concrete are studied.The results show there are better correlations among those parameters,the tested diffusion coefficients using the natural diffusion method are bigger than those diffusion coefficients using the bridge method,and the tested results using the NEL method are similar to the results by the bridge method.