混凝土在复合盐侵蚀环境中的微观结构变化

Variation of micro-structure of concrete in mixed salt erosion environment

盐类侵蚀是导致混凝土耐久性破坏的主要因素之一。试验观察了混凝土遭受单盐及复合盐长期半浸泡情况下的相对动弹性模量的变化情况,发现在相同浓度情况下混凝土在复合盐中的相对动弹性模量比在单盐环境中的下降快。通过扫描电镜对侵蚀后混凝土内部进行观察,从微观结构变化方面对这一现象进行了研究,为混凝土结构的耐久性设计提供参考依据。

Salt erosion is one of main factors causing the durability damage to concrete.Based on the salt water immersion test,the variation of relative dynamic elastic modulus of concrete is investigated.The test results obviously indicated that the relative dynamic elastic modulus of concrete in the mixedsalt environment dropped more rapidly than that in single salt environment.According to the SEM test,the change of micro-structure of concrete isstudied in order to supply references to the durability design of concrete structure.