超高性能混凝土在模拟污水环境中的劣化过程研究  

Degradation progress of ultra-high performance concrete exposed to simulated sewage environment

作　　者：胡文佩 李华兵 郭晓潞[3] HU Wenpei;LI Huabing;GUO Xiaolu(Shanghai Municipal Planning and Design Institute Co.,Ltd.,Shanghai 200031,China;Shanghai Engineering Research Center of Urban Road Ecological Technology,Shanghai 200031,China;Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,School of Materials Science and Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]上海市市政规划设计研究院有限公司,上海200031 [2]上海城市路域生态工程技术研究中心,上海200031 [3]同济大学材料科学与工程学院先进土木工程材料教育部重点实验室,上海201804

出　　处：《混凝土与水泥制品》2024年第4期1-6,共6页China Concrete and Cement Products

基　　金：国家重点研发计划专项项目(2021YFB3802001);国家自然科学基金项目(52178241、52242807);上海市“科技创新行动计划”社会发展科技攻关项目(21DZ1202804);中央高校基本科研业务费专项资金资助项目(22120220599)。

摘　　要：制备浓度均为5%的硫酸溶液和柠檬酸溶液模拟污水环境,对比研究了普通混凝土(NC)和超高性能混凝土(UHPC)在模拟污水环境中的耐腐蚀性能和劣化过程。结果表明:经两种腐蚀溶液浸泡后,UHPC的外观破坏、腐蚀深度及劣化深度均远低于NC;浸泡106 d后,浸泡UHPC腐蚀溶液的pH值趋于稳定,而浸泡NC的腐蚀溶液pH值则持续上升;与NC相比,经硫酸溶液浸泡后,UHPC腐蚀表面的微观结构更密实,腐蚀表面仍有富余的Ca2+来有效防止硫渗入,从而使UHPC更耐酸腐蚀。Sulfuric acid solution and citric acid solution,both with the concentration of 5%,were prepared to simulate the sewage environment,and the corrosion resistance and deterioration process of normal concrete(NC)and ultra-high performance concrete(UHPC)in the simulated sewage environment were compared and studied.The results show that after soaking in the two corrosive solutions,the appearance damage,corrosion depth and deterioration depth of UHPC are much lower than those of NC.After soaking for 106 d,the pH value of the corrosion solution soaked in UHPC immersed tends to stabilize,while the pH value of the corrosion solution soaked in NC continues to increase.Compared with NC,the microstructure of the corrosion surface of UHPC is denser after soaking in sulfuric acid solution,and the corrosion surface is still rich in calcium to effectively prevent sulfur infiltration,which makes UHPC more resistant to acid corrosion.

关 键 词：超高性能混凝土 污水环境 硫酸 柠檬酸 腐蚀机理 劣化过程 

分 类 号：TU528.31[建筑科学—建筑技术科学]