纳米二氧化硅对水泥石的氯离子结合量影响  

Effect of nano silica on chloride binding ability of cement paste

作　　者：刘春登 丁天云 魏鹏程 曾有旭 储洪强[2] 蒋林华[2] LIU Chundeng;DING Tianyun;WEI Pengcheng;ZENG Youxu;CHU Hongqiang;JIANG Linhua(Tianchang Hydropower Construction and Installation Engineering Company,Chuzhou 239300,China;College of Mechanics and Materials,Hohai University,Nanjing 211100,China)

机构地区：[1]天长市水电建筑安装工程公司,安徽滁州239300 [2]河海大学力学与材料学院,江苏南京211100

出　　处：《混凝土》2023年第12期145-151,共7页Concrete

基　　金：江苏省重点研发计划项目(BE2020780)。

摘　　要：混凝土孔溶液中的自由氯离子容易造成钢筋锈蚀和混凝土结构开裂,导致混凝土建筑结构破坏。研究将混凝土孔溶液中的自由氯离子转化为结合氯离子,对混凝土结构的稳定性有着十分重要的意义。试验以纳米二氧化硅掺量和氯离子浓度为变量,研究了纳米二氧化硅对水泥石的氯离子结合量影响,根据等温吸附理论绘制结合氯离子与自由氯离子的拟合关系曲线,通过XRD分析、热重分析研究水泥石的氯离子结合机理。结果表明:纳米二氧化硅的掺入对水泥石的氯离子结合量有改善作用、能够加快水泥水化、促进C-S-H凝胶和Friedel′s盐的生成,有利于水泥石的氯离子物理吸附和化学结合。The free chloride ion in concrete pore solution is easy to cause reinforcement corrosion and concrete structure cracking,resulting in the damage of concrete building structure.The research on the conversion of free chloride ions into bound chloride ions in concrete pore solution is of great significance to the stability of concrete structure.The effect of nano silica on the chloride ion binding capacity of cement paste was studied by taking the content and chloride ion concentration as variables.The fitting relationship curve between bound chloride ion and free chloride ion was drawn according to the isothermal adsorption theory.The chloride ion binding mechanism of cement paste was studied by XRD analysis and thermogravimetric analysis.The results show that the incorporation of nano silica can improve the chloride ion binding capacity of cement paste and promote hydration of cement,promote the formation of C-S-H gel and Friedel′s salt.The incorporation of nano and facilitate the physical adsorption and chemical bonding of chloride ions through cement paste.

关 键 词：纳米二氧化硅 水泥石 氯离子结合量 结合氯离子 自由氯离子 氯离子等温吸附 

分 类 号：TU528.041[建筑科学—建筑技术科学]