多场腐蚀耦合作用下混凝土耐久性变化分析

Analysis on durability change of concrete under multi field corrosion coupling

为研究腐蚀环境下混凝土耐久性性能变化,开展了氯离子腐蚀、硫酸根离子腐蚀和氯离子-硫酸根离子共同腐蚀作用下混凝土耐久性性能变化研究,并对比分析了单一腐蚀因素对混凝土耐久性性能的影响。试验结果表明,在单一因素腐蚀试验下,随着混凝土深度的递增,混凝土中氯离子和硫酸根离子的含量也逐渐降低;在单一因素腐蚀试验下,硫酸盐离子对混凝土耐久性的影响要高于氯离子;耦合环境下混凝土耐久性性能迅速下降,其影响性能要高于硫酸盐环境和氯离子环境。

In order to study the changes of concrete durability under corrosive environment,this paper carried out a study on the durability performance of concrete under the action of chloride ion corrosion,sulfate ion corrosion and chloride-sulfate ion joint corrosion,and compared and analyzed the influence of a single corrosion factor on the durability performance of concrete.The results showed that under the single factor corrosion test,with the increase of concrete depth,the content of chloride ion and sulfate ion in concrete gradually decreased.Under the single factor corrosion test,the influence of sulfate ion on concrete durability was higher than that of chloride ion.Under the coupling environment,the concrete durability decreased rapidly,and its influence performance was higher than that in the sulfate environment and chloride ion environment.