混凝土在浸泡和干湿循环作用下的抗氯盐侵蚀性能

摘要

该文采用自然浸泡和干湿循环试验方法研究了不同浓度氯盐浸泡的混凝土在干湿循环后的盐胀破坏特征.研究结果表明,混凝土经氯盐溶液干湿循环作用后,随干湿循环龄期增加,其抗压强度略有下降,抗折强度下降明显.微观分析发现,经干湿循环作用后,氯离子含量高的溶液对混凝土侵蚀较为严重,全浸泡对混凝土的强度影响较小.%The salt expansion damage characteristics of concrete are studied using test methods of the full soaking and the wet-dry cycling. The research result shows that,after the wet-dry cycling of the chloride solution with different chloride concentrations, the compressive strength of concrete decreases slightly and the flexural strength decreases obviously with the wet-dry cycling age increasing. The microscopic analysis also shows that,the solution of the chloride snow-melting agent with the high chloride concentration has more serious effect on the concrete erosion under the wet-dry cycling condition,and the full soaking has little effect on the strength of concrete.