Carbonation of Pure Minerals in Portland Cement:Evolution in Products as a Function of Water-to-solid Ratio  

作　　者：XIONG Kun SHANG Xiaopeng LI Hongyan WANG Dan 熊坤;王丹

机构地区：[1]Zhengzhou Lutong Highway Construction Co.,Ltd.,Zhengzhou 450052,China [2](Special Glass Key Lab of Hainan Province)&(State Key Laboratory of Marine Resource Utilization in South China Sea),Hainan University,Haikou 570228,China [3]Department of Architectural Engineering,Shandong Urban Construction Vocational College,Jinan 250103,China [4](State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Sobute New Materials Co.,Ltd.)&(School of Material Science and Engineering,Southeast University,Nanjing 211189,China)

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第5期1214-1222,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Hainan Provincial Natural Science Foundation of China(No.522QN279);State Key Laboratory of High Performance Civil Engineering Materials(No.2023CEM004);Natural Science Foundation of Jiangsu Province(No.BK20231088)。

摘　　要：Minerals in Portland cement including tricalcium silicate(C_(3)S),β-dicalcium silicate(β-C_(2)S),tricalcium aluminate(C_(3)A),and tetracalcium ferroaluminate(C_(4)AF),show a significantly different activity and product evolution for CO_(2)curing at various water-to-solid ratios.These pure minerals were synthesized and subject to CO_(2)curing in this study to make an in-depth understanding for the carbonation properties of cement-based materials.Results showed that the optimum water-to-solid ratios of C_(3)S,β-C_(2)S,C_(3)A and C_(4)AF were 0.25,0.15,0.30 and 0.40 for carbonation,corresponding to 2 h carbonation degree of 38.5%,38.5%,24.2%,and 21.9%,respectively.The produced calcite duringβ-C_(2)S carbonation decreased as the water-to-solid ratio increased,with an increase in content of metastable CaCO_(3)of vaterite and aragonite.The thermodynamic stability of CaCO_(3)produced during carbonation was C_(3)A>C_(4)AF>β-C_(2)S>C_(3)S.The carbonation degree of Portland cement was predicted based on the results of pure minerals and the composition of cement,and the error of predicted production of CaCO_(3)was only 1.1%,which provides a potential method to predict carbonation properties of systems with a complex mineral composition.

关 键 词：accelerated carbonation portland cement calcium carbonate water-to-solid ratio 

分 类 号：TQ172.1[化学工程—水泥工业]