溶蚀残留层对硫酸侵蚀砂浆速度的影响  

Effect of Dissolved Residual Layer on the Rate of Mortar Corroded by Sulfuric Acid

作　　者：毛敏 宋志刚[1] 谢世华 起洋砚 李贤胜[1] MAO Min;SONG Zhi-gang;XIE Shi-hua;QI Yang-yan;LI Xian-sheng(Faculty of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650000,China)

机构地区：[1]昆明理工大学建筑工程学院

出　　处：《硅酸盐通报》2019年第10期3326-3331,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51078175)

摘　　要：经硫酸侵蚀后的水泥砂浆试件表面的溶蚀残留物会减缓侵蚀速度,结合10组水泥砂浆试块长期浸泡试验和SEM、XRD分析,研究了溶蚀残留物对侵蚀速度的影响。结果表明:浸泡过程中并没有固态CaSO4析出,试件表层溶蚀剩余产物的成分是以SiO2为主的水泥石经溶蚀后的残留矿物;试验过程中试件表面溶蚀残留层对耗酸量的影响远高于水胶比对耗酸量的影响;不同控制条件下耗酸量及其比值均按浸泡时间的幂函数关系增长,浸泡至2300 h时,表面清洗条件下试件耗酸量比表面不清洗条件下试件耗酸量高16.83%~24.63%。The residue layer on the surface of mortar formed by sulfuric acid attacking will slow down the corrosion rate.The experimental data of long time immersion tests and the analysis of SEM and XRD of ten groups of mortar specimens were analyzed to investigate the effects of residue layer on the corrosion rate.The results show that solid CaSO4 precipitation does not occur and the composition of the surface layer,mainly composed by SiO2,are the residual minerals after mortar leaching.The residual layer has much more effect on the acid consumption than water-binder ratio.The results also indicate a power law of acid consumption with socking time under different experimental conditions.The groups under the cleaning and replacing condition have 16.83%-24.63% more acid consumption than those groups without cleaning and replacing when immersed to 2300 h.

关 键 词：水泥砂浆 硫酸 溶蚀 附着层 速度 

分 类 号：TU525[建筑科学—建筑技术科学]