Hydration Mechanism of Cement-based Materials with Different Si-rich Mineral Admixtures  

作　　者：何真 胡玲玲 

机构地区：[1]State Key Laboratory of Water Resources & Hydropower Engineering Science, Wuhan University [2]School of Water Resources and Hydropower Engineering, Wuhan University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2018年第3期654-660,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Key Research Program(973 Program)(No.2015CB655101);the National Natural Science Foundation of China(No.51379163)

摘　　要：Early hydration mechanism of cement-based materials with silica fume, nano-SiO2 and silica sol of different contents was investigated, and the detailed effect of these Si-rich mineral admixtures in three stages of early hydration（NG, I, D） using kinetics model was focused. The results showed that silica fume, nano-SiO2, and silica sol have significant effect on kinetic parameters n, k1, k2 and k3, the fineness and existing form of SiO2 particles in these Si-rich mineral admixtures are two important factors to affect the hydration process and on the parameters. Through integrated use of methods of hydration heat-Krstulovic-Dabic Modelsynthetical thermal analysis, data of hydration heat were collected, hydration degree was characterized, as well as the resulting crystallization behavior of early hydration, to build a numerical relationship between parameter n and CH contents that n decreases with increasing CH, and thus, a direct connection between hydration heat release behavior and crystallization behavior has been established.Early hydration mechanism of cement-based materials with silica fume, nano-SiO2 and silica sol of different contents was investigated, and the detailed effect of these Si-rich mineral admixtures in three stages of early hydration（NG, I, D） using kinetics model was focused. The results showed that silica fume, nano-SiO2, and silica sol have significant effect on kinetic parameters n, k1, k2 and k3, the fineness and existing form of SiO2 particles in these Si-rich mineral admixtures are two important factors to affect the hydration process and on the parameters. Through integrated use of methods of hydration heat-Krstulovic-Dabic Modelsynthetical thermal analysis, data of hydration heat were collected, hydration degree was characterized, as well as the resulting crystallization behavior of early hydration, to build a numerical relationship between parameter n and CH contents that n decreases with increasing CH, and thus, a direct connection between hydration heat release behavior and crystallization behavior has been established.

关 键 词：silica fume nano-SiO2 silica sol hydration kinetics model early hydration CH content 

分 类 号：TU528[建筑科学—建筑技术科学]