Effect of Calcium Silicate Hydrate Seeds on Hydration and Mechanical Properties of Cement  

作　　者：WANG Yisa LÜLinnü HE Yongjia WANG Fazhou HU Shuguang 王以撒;吕林女;HE Yongjia;WANG Fazhou;HU Shuguang(Hubei Key laboratory of Theory and Application of Advanced Materials Mechanics(School of Science,Wuhan University of Technology),Wuhan 430070,China;State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology),Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]Hubei Key laboratory of Theory and Application of Advanced Materials Mechanics(School of Science,Wuhan University of Technology),Wuhan 430070,China [2]State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology),Wuhan 430070,China [3]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2021年第1期103-110,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by National Key R&D Program of China(No.2017YFB0310001);the National Natural Science Foundation of China(Nos.51772226,51972249,51872216)。

摘　　要：C-S-H series are synthesized at different temperatures and ages by pozzolanic reaction.The change of particle size distribution,phase composition,morphology and nanostructure of C-S-H with temperatures and ages,and the effects of C-S-H seeds and seeds parameters on the hydration behavior and mechanical properties development of cement were investigated by DLS,XRD,SEM,^(29)Si NMR,TAM-air isothermal calorimeter and mechanical properties test.The results show that the particle size,crystallinity,basal spacing and Q^(2)/Q^(1) ratio of C-S-H increases with the increase of synthesis temperature and age.The addition of synthesized C-S-H seeds to cement pastes results in the strong acceleration effect on cement hydration and significant improvement of the early strength of cement paste and mortar.The 1 day-C-S-H seeds synthesized at room temperature can increase the strength of cement paste by about 30 MPa at 12 h.The effect does not show a very regular change with the increase of the temperature and age of seeds synthesis.Considering the effect of C-S-H seeds on the hydration and mechanical properties of cement,and economy and short cycle of seeds synthesis,the C-S-H seeds synthesized at room temperature for 1 day or 55 ℃ water bath for 12 hours is recommended..

关 键 词：calcium silicate hydrate(C-S-H) SEEDS HYDRATION mechanical property temperature 

分 类 号：TQ172.1[化学工程—水泥工业]