Experimental Verification on Conversion Mechanism of Calcium Aluminate Cement Hydrates
Calcium aluminate cement(CAC)is a commonly used binder for refractory castables.There has been a long-running debate on the transformation mechanisms of calcium aluminate cement hydrates through solid-state reaction or solution-precipitation.In order to demonstrate if the conversion of CaO·Al2O3·10H2O(CAH10)to 3CaO·Al2O3·6H2O(C3AH6)and Al2O3·3H2O(AH3)happens through which approach,the CAC pastes cured at 10℃ to produce CAH10 was further cured at 60℃ with and without free water.The hydration of the pastes was halted by freeze-drying,and the phases and microstructure of hydrates were investigated by XRD and SEM respectively.The results indicate that CAH10 converted into C3AH6 and AH3 in water presence at 60℃,but did not transform into C3AH6 and AH3 without water,demonstrating that conversion of CAH10 into C3AH6 and AH3 does not happen through solid-state reaction,but takes place through preceding dissolution of CAH10 and subsequent precipitates C3AH6 from the solution.
calcium aluminate cement hydrates conversion
ZHANG Yang GU Wenjing LIU Kun DING Dafei WANG Qingfeng YE Guotian
Henan Key Laboratory of High Temperature Functional Ceramics,School of Materials Science and Enginee Department of Materials Science and Engineering,Luoyang Institute of Science and Technology,90 Wangc
国际会议
Conference on Refractories International 2018, CRI2018)(2018国际耐火材料学术会议)
杭州
英文
1-6
2018-10-17（万方平台首次上网日期，不代表论文的发表时间）