矿渣水泥基复合材料在杂散电流作用下的抗软水溶蚀机理研究  

Soft Water Leaching Resistance Mechanism of Slag Cement Based Composites under Stray Current

作　　者：韩瑜[1,2] 赵方粒 赵翊彤 王宝民 HAN Yu;ZHAO Fangli;ZHAO Yitong;WANG Baomin(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;Liaoning Building Science Research Institute,Shenyang 110005,China;Power China Chengdu Engineering Co.,Ltd.,Chengdu 610072,China)

机构地区：[1]大连理工大学土木工程学院,大连116024 [2]辽宁省建设科学研究院有限责任公司,沈阳110005 [3]中国电建集团成都勘测设计研究院有限公司,成都610072

出　　处：《硅酸盐通报》2024年第1期200-208,共9页Bulletin of the Chinese Ceramic Society

基　　金：辽宁省重点研发计划项目(2020JH2/10100016)。

摘　　要：在轨道交通工程运营期间,复杂的服役环境导致混凝土结构耐久性下降。本文主要研究了在杂散电流与软水溶蚀耦合作用下,矿渣掺量、水胶比和杂散电流电压强度对矿渣水泥基复合材料微观结构的影响。结合X射线衍射、热重、扫描电子显微镜和压汞等方法,分析了矿渣水泥基复合材料经溶蚀90 d后的物相组成、Ca(OH)_(2)含量、微观形貌以及孔结构变化。研究结果表明:矿渣掺量越大,矿渣水泥基复合材料内部的Ca(OH)_(2)含量越少,材料的孔隙率越低,结构更均匀致密;随着杂散电流电压强度的增加,矿渣水泥基复合材料内部的Ca(OH)_(2)和AFt含量变少,且AFt和Ca(OH)_(2)等物相边界变得模糊不清;矿渣水泥基复合材料中C-(A)-S-H的含量略有增多,孔隙率略有下降;随着水胶比的增大,矿渣水泥基复合材料内部的Ca(OH)_(2)含量变少,剩余物相含量变少,微观结构变得松散多孔,孔径结构整体粗化,孔隙率增大。During the usage of railway transport,the complex environment leads to the decrease of durability of concrete structure.The effects of slag content,water-binder ratio and stray current voltage intensity on the microstructure of slag cement based composites under the coupling effect of stray current and soft water leaching were studied.The phase composition,Ca(OH)_(2) content,microstructure and pore structure of slag cement based composites after 90 d calcium leaching were analyzed by X-ray diffraction,thermogravimetric analysis,scanning electron microscopy and mercury intrusion method.The results show that the larger the slag content,the less Ca(OH)_(2) content in slag cement based composites,the lower the porosity,and the more uniform and dense the structure.With the increase of stray current voltage intensity,Ca(OH)_(2) and AFt content in slag cement based composites decreases,and the phase boundaries of AFt and Ca(OH)_(2) become blurred.C-(A)-S-H content in the material increases slightly,and the porosity decreases slightly.With the increase of water-binder ratio,Ca(OH)_(2) content in the material decreases,the residual phase content decreases,the microstructure becomes loose and porous,the pore size structure coarsens as a whole,and the porosity increases.

关 键 词：矿渣水泥基复合材料 杂散电流 软水溶蚀 矿渣掺量 水胶比 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]