关于“混凝土硫酸盐结晶破坏”理论的研究进展

Research Progress on Theory of "Sulfate Salt Weathering on Concrete"

当混凝土构件半掩埋在含有硫酸盐的土壤或地下水中时,暴露在空气中的混凝土会发生类似于其他多孔材料(如岩石、多孔砖等)的破坏方式。混凝土科技工作者认为是硫酸盐结晶导致了混凝土破坏,对这方面的研究也越来越受到重视。但是,对于"混凝土硫酸盐结晶破坏"这一课题未有系统的研究报道,并缺乏对已有研究成果的总结和理论分析。本文详细分析了已有相关试验室和野外长期试验结果,对比多孔材料盐结晶经典理论发现,有关"混凝土硫酸盐结晶破坏"的试验结果和现象与盐结晶经典理论存在很大的争议,并没有充分的理由说明硫酸盐结晶破坏是导致混凝土破坏的主要原因,而通常所说的硫酸盐化学侵蚀依然可能是其主要破坏机理。最后,针对存有争议的试验结果,提出了需要进一步研究的一些问题。

Physical sulfate attack on concrete has received more attentions. Due to the similar behavior between concrete and other porous materials, ＂sulfate salt weathering＂ becomes a degradation mechanism for deteriorated concrete close to the earth face. How- ever, this aspect is not well understood. In this paper, some disputations were summarized and discussed based on the extensive re- view of long-term field and lab-scale studies on ＂sulfate salt weathering on concrete＂. Consistent with disputed remarks, some issues that need to be further investigated were described in detail. This paper also provided a framework for considering the complexity of ＂sulfate salt weathering on concrete＂ and suggested a systematic future research for the scientific conclusions.