氯盐-硫酸盐对水泥基材料的复合侵蚀破坏  

Combined Attack of Chloride-Sulfate on Cement-Based Materials

作　　者：刘加平[1] 刘玉静[1] 石亮 穆松 

机构地区：[1]东南大学材料科学与工程学院,江苏南京210096 [2]江苏苏博特新材料股份有限公司,江苏南京211103

出　　处：《建筑材料学报》2016年第6期993-997,共5页Journal of Building Materials

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB655105);国家自然科学基金青年基金资助项目(51308262);江苏省自然科学基金面上项目(BK20161101);江苏省自然科学基金青年基金项目(BK20131012)

摘　　要：研究了氯盐和硫酸盐对水泥基材料的复合侵蚀破坏.结果表明:侵蚀过程中试件的质量变化率与膨胀率之间呈指数关系,氯盐降低了硫酸盐侵蚀过程中试件发生膨胀破坏的风险,这是因为氯盐抑制了硫酸根离子向试件内部的传输,同时削弱了硫酸根离子与水泥矿物的化学结合能力,减少了膨胀性侵蚀产物的生成量;另外氯离子能优先与C3A反应,生成的Friedel’s盐会填充试件孔隙,使孔径细化,进一步限制硫酸根离子参与反应的能力.Combined attack of chloride and sulfate on cement-based materials was investigated. The results show that, the mass change ratio is a exponential function of expansion ratio for the specimens during the process of sulfate attack. Chloride can decrease the risk of expansive damage of specimens under sulfate attack. Chloride inhibits transport of sulfate ions. Meanwhile, the chemical-bond energy between sulfate ions and cement minerals is weakened, which results in decrease of corrosion products content. Simultaneously, the chloride ions preferentially react with C3A to produce the Friedel＇s salt. The reaction product fills the capillary pore and decreases the pore size of specimens. The reaction capacity of sulfate ions with cement minerals is further restricted.

关 键 词：氯盐-硫酸盐 水泥基材料 离子传输 侵蚀反应 孔结构 

分 类 号：TU528.01[建筑科学—建筑技术科学]