Calcium Carbonate and Ettringite Induced Efflorescence in CAC-Anhydrite Binary Systems  

作　　者：SUN Zixuan CHEN Yuting XU Linglin LIU Siyu YU Long PAN Feng WANG Chaoqiang WU Kai YANG Zhenghong 孙子璇;徐玲琳

机构地区：[1]Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,School of Materials Science and Engineering,Tongji University,Shanghai 201804,China [2]Shanghai Construction No.5(Group)Co.,Ltd.,Shanghai 200063,China [3]School of Material Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第5期1129-1137,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Key Research and Development Program of China(No.2022YFC3803400);National Natural Science Foundation of China(Nos.52378255,52278270);Shanghai Municipal Science and Technology Major Project(No.2021SHZDZX0100);the Fundamental Research Funds for the Central Universities and the Experimental Center of Materials Science and Engineering in Tongji University。

摘　　要：We focused on the efflorescence induced microstructural evolution of ettringite-rich systems prepared with calcium aluminate cement(CAC)and anhydrite.The effects of anhydrite on the visible efflorescence,and the corresponding capillary absorption of CAC-anhydrite mortars were revealed.The composition and microstructure of efflorescence-causing substances were investigated by optical microscope,in-situ Raman spectroscopy,scanning electron microscope,energy dispersive spectrometer,thermogravimetric analysis,and differential scanning calorimetry,at multi-scales.Results indicate that,besides the calcium carbonate,ettringite is another main component of efflorescence-causing substances.Compared with the neat CAC mortars,the addition of anhydrite has a significant effect on the degree of efflorescence by acting on the composition of hydration products and pore structure.In addition,methods are proposed for the prevention of efflorescence of CAC-anhydrite binary system.

关 键 词：calcium aluminate cement ANHYDRITE EFFLORESCENCE ETTRINGITE phase assemblage pore structure 

分 类 号：TQ172.1[化学工程—水泥工业] TQ177.3[化学工程—硅酸盐工业]