环氧-水泥基渗透结晶型复合涂层对混凝土氯盐冻融防护性能的影响OA

This study investigated the protective effect of epoxy-cement-based permeable crystalline composite coating on concrete structures in a chloride freeze-thaw environment.Rapid freeze-thaw tests,chloride ion penetration resistance performance tests,and durability tests under combined chloride and freeze-thaw environment were conducted.The variations in key parameters,including the relative dynamic elastic modulus,mass loss rate,and chloride ion diffusion coefficient of concrete specimens were measured.The results indicate that,compared to the two single coatings(epoxy anti-corrosion coating and cement-based permeable crystalline material),the composite coating significantly reduces the chloride ion diffusion coefficient of concrete specimens,effectively slows the decline in relative dynamic elastic modulus and mass loss rate,and delays the onset of freeze-thaw damage.Based on the modified Duracrete model,the service life of concrete structures with different coatings under chloride freeze-thaw environment was predicted.In submerged,tidal,and atmospheric zones,the service life of concrete structures coated with the composite coating increases by approximately 90.6％,92.9％,and 90.7％,respectively,compared to those with a single epoxy coating,and by approximately 55.6％,74.4％,and 66.4％,respectively,compared to those with a single cement-based permeable crystalline coating.These findings demonstrate that the epoxy-cement-based permeable crystalline composite coating can effectively extend the service life of concrete structures in chloride salt freeze-thaw environment.