Study on Influence of Cooling Mode on the Permeability of High Temperature Damaged Concrete

摘要

Two experiments of capillary suction and chloride penetration were carried out on the concrete specimens after exposure to natural cooling and spray water-cooling, and absorption coefficient and permeability coefficient were used to estimate the combining influence of cooling mode and temperature. The results show that high temperature cause severe degradation both the capillary suction and chloride ion resistance of concrete. Owing to short spray cooling time, the large temperature difference between inside and outside of concrete and large temperature stress, which accelerate progressive ion penetrating from outside. Then water absorption coefficient and chloride ion content in concrete surface is significantly greater than that of exposure to natural cooling. Therefore, spray water cooling mode has worse effect on permeability of concrete damaged in high temperature.