混凝土在氯离子侵蚀和冻融耦合作用下的研究

RESEARCH ON COUPLING INDUCTION OF CHLORIDE EROSION AND FREEZE-THAW FOR CONCRETE

氯盐作为最主要的除冰盐,一方面可以清除冰雪;另一方面在冻融循环下,氯盐将引起混凝土路面的破坏和钢筋的锈蚀。对盐冻破坏机理以及氯离子侵蚀和冻融的相互影响作用进行了较全面的综述,分析了氯离子在混凝土中的侵蚀过程与冻融损伤对氯离子侵蚀作用的影响,并对其发展进行了展望。介绍了近年来一些学者的研究成果,提出氯离子在混凝土中的扩散不仅与自身性质有关,还受氯盐种类及冻融循环等外部因素的影响。此外,回归分析结果表明,冻融损伤与氯离子扩散系数、扩散深度之间均可以建立良好的非线性关系。

Chloride,on the one hand,the chlorine salt as the most main deicing salt can eliminate snow and ice,on the other hand, in the freeze-thaw cycle of chlorine salt will cause the destruction of the concrete pavement and corrosion of steel. This article generally summarize about mechanism of fracture of deicer-scaling and the influence between erosion and freeze thawing of chloridion, meanwhile analysing the erosion process and the damage of freeze thawing of chloridion in concrete, that is chloridion erosion effect, and points out its development. Some research results were presented in recent years,and this paper proposed that chloride diffusion in concrete not only associated with the nature of their own, but also affected by chloride and freeze-thaw cycles and other types of external factors Furthermore, regression analysis showed that both the freeze-thaw, chloride diffusion coefficient and diffusion depth have a good nonlinear relationship.