氯盐环境下杂散电流对水泥水化产物赋存状态的影响  

Influence of stray current on occurrence state of cement hydration products in chlorine salt environment

作　　者：庄华夏 徐菲 蔡跃波[2] 钱文勋 ZHUANG Huaxia;XU Fei;CAI Yuebo;QIAN Wenxun(Wuhu Institute of Techonolgy,Wuhu 241003,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]芜湖职业技术学院,安徽芜湖241003 [2]南京水利科学研究院,江苏南京210029

出　　处：《混凝土》2022年第9期49-55,共7页Concrete

基　　金：国家重点研发计划(2018YFC0406702);安徽省教育厅高校自然科学研究项目(KJ2021A1337)。

摘　　要：设计了氯盐环境下水泥净浆加载杂散电流的浸泡试验,分析了试验现象,测定了不同周期溶液的pH值和Ca^(2+)含量,表征了水泥水化产物中Ca^(2+)的溶出特征,并通过XRD、TG和SEM-EDS测试进一步分析了氯盐环境下杂散电流对水泥水化产物的组成、含量及微观形貌的影响。试验结果表明:氯盐环境下,杂散电流将加速水泥水化产物中Ca^(2+)的溶出,引起CH和C-S-H凝胶的分解,影响F盐的生成,改变CH和C-S-H凝胶的微观形貌;杂散电流对水泥基材料中不同部位水泥水化产物赋存状态的影响不同,其机理主要在于杂散电流引起的离子迁移及环境pH改变。The soaking test of cement paste under the effect of stray current in chlorine salt environment was designed,and the test phenomenon was analyzed.The pH value and Ca^(2+) content in the solution of different periods were measured,the characteristics of Ca^(2+) leaching in cement hydration products were presented.Through XRD,TG and SEM-EDS analysis,the influences of stray current on the composition,content,microstructure of cement hydration products were studied.The results show that,the stray current will accelerate the dissolution of Ca^(2+) in cement hydration products,cause the decomposition of CH and C-S-H gel,affect the formation of Friedel′s salt,change the microstructure of CH and C-S-H gel in chlorine salt environment.The influences of stray current on occurrence state of cement hydration products in different parts are different,the influence mechanism mainly consists in the ion migration and the change of environmental pH caused by stray current.

关 键 词：杂散电流 氯盐环境 水泥水化产物 赋存状态 F盐 

分 类 号：TU528.01[建筑科学—建筑技术科学]