盐溶液腐蚀条件下水泥基材料性能研究  

Research on the properties of cement-based materials under salt solution corrosion conditions

作　　者：陈彦文[1] 才浩洋 张强[1] CHEN Yanwen;CAI Haoyang;ZHANG Qiang(College of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168

出　　处：《新型建筑材料》2025年第3期27-30,74,共5页New Building Materials

基　　金：辽宁省教育厅项目(LJKF20220225)。

摘　　要：根据海水中盐的组成及含量,设计NaCl、Na_(2)SO_(4)两种单盐体系和Na Cl、Na_(2)SO_(4)等复合多盐体系的腐蚀溶液,研究水泥基材料在盐溶液腐蚀下物理性能和水化产物的变化规律。结果表明:单盐体系溶液腐蚀龄期至28 d,水泥基材料质量均增大,Na Cl溶液浸泡后质量增大幅度大于Na_(2)SO_(4)溶液;5%NaCl溶液浸泡至150 d,质量损失达0.70%;干湿循环过程中,循环次数达到30次,质量减小,最大损失率0.13%;2种单盐体系腐蚀下,抗压、抗折强度均随干湿循环次数增加先提高后降低,复合盐溶液体系腐蚀下,抗折强度均随干湿循环次数增加持续降低;复合盐溶液-干湿循环条件对孔径影响更大,孔径≥0.5 mm有害孔数量增加。According to the composition and content of salt in seawater,the corrosion solutions of two single salt systems of NaCl and Na_(2)SO_(4) and composite multi-salt systems of NaCl and Na_(2)SO_(4) were designed to study the physical properties and hydration products of cement-based materials under salt solution corrosion.The results show that the mass of cement-based materials increases from the corrosion age of single salt system solution to 28 d,and the mass increase after soaking in NaCl solution is greater than that in Na_(2)SO_(4) solution.Soaking in 5%NaCl solution to 150 d,the mass loss reached 0.70%;in the process of dry-wet cycle,the number of cycles reached 30 times,the mass showed a decreasing trend,and the maximum loss rate was 0.13%.Under the corrosion of two single salt systems,the compressive strength and flexural strength first increased and then decreased with the increase of dry and wet cycle times.Under the corrosion of composite salt solution,the flexural strength continued to decrease with the increase of dry and wet cycle times.The composite salt solution-dry-wet cycle group had a more serious effect on the pore size,and the number of harmful pores with pore size≥0.5 mm increased.

关 键 词：盐溶液 干湿循环 混凝土力学性能 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]