Experimental Study on Improving Salt Insulation of Concrete for Precast Members

Abstract

In this study, an electrophoresis test was carried out to measure the diffusion coefficient of chloride ions in a short period of time for the purpose of improving the durability of precast concrete. In addition, similar experiments were conducted to verify the applicability to the repair material of the concrete cross-sectional defect and the fixing part for connection. As a result, we were able to confirm the effect of suppressing the permeation of chloride ions by adding a salt damage-resistant admixture to concrete and repair materials. The salt damage resistant admixture can be expected to improve the salt damage resistance performance of not only concrete but also repair materials. However, the addition of expansive materials makes the internal structure of concrete looser and reduces resistance to salt damage. In addition, it was found that electrophoresis inspection is useful in shortening the inspection time compared to the conventional sodium chloride solution immersion inspection.