Experimental Observing Damage Evolution in Cement Pastes Exposed to External Sulfate Attack by in situ X-ray Computed Tomography  

作　　者：WU Min CAO Kailei XIAO Weirong YU Zetai CAO Jierong DING Qingjun LI Jinhui 吴敏;曹杰荣(China Railway Construction Corporation Harbour and Channel Engineering Bureau Group Co.,LTD,Zhuhai 519000,China;State Key Laboratory of Silicate Material for Architecture(Wuhan University of Technology),Wuhan 430070,China)

机构地区：[1]China Railway Construction Corporation Harbour and Channel Engineering Bureau Group Co.,LTD,Zhuhai 519000,China [2]Con-struction Headquarters of Zhoushan Liuheng Bridge Phase II Project,Zhoushan 316000,China [3]China Railway Construction Bridge En-gineering Bureau Group Co.,LTD,Tianjin 300000,China [4]State Key Laboratory of Silicate Material for Architecture(Wuhan University of Technology),Wuhan 430070,China [5]College of Materials Science and Engineering,Wuhan Textile University,Wuhan 430200,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2025年第1期164-170,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Chinese National Natural Science Foundation of China(No.U2006224)。

摘　　要：The paper presents experimental investigation results of crack pattern change in cement pastes caused by external sulfate attack(ESA).To visualize the formation and development of cracks in cement pastes under ESA,an X-ray computed tomography(X-ray CT)was used,i e,the tomography system of Zeiss Xradia 510 versa.The results indicate that X-CT can monitor the development process and distribution characteristics of the internal cracks of cement pastes under ESA with attack time.In addition,the C3A content in the cement significantly affects the damage mode of cement paste specimens during sulfate erosion.The damage of ordinary Portland cement(OPC)pastes subjected to sulfate attack with high C3A content are severe,while the damage of sulfate resistant Portland cement(SRPC)pastes is much smaller than that of OPC pastes.Furthermore,a quadratic function describes the correlation between the crack volume fraction and development depth for two cement pastes immermed in sulfate solution.

关 键 词：CONCRETE external sulfate attack damage evolution situ X-ray computed tomography 

分 类 号：TU528[建筑科学—建筑技术科学]