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《Engineering Journal of Wuhan University》 2007-01
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Effect of shrinkage-reducing admixture on hydration and shrinkage deformation of cement-based materials at early ages

CHEN Meizhu1,ZHOU Mingkai1,WU Shaopeng1,HE Zhen2(1.Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education,Wuhan University of Technology,Wuhan 430070,China;2.State Key Laboratory of Water Resourcesand Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)  
Electrical resistivity at normal temperature and semi-adiabatic temperature-rise of cement pastes with variant dosage of shrinkagereducing admixtures(SRA) were tested using a non contact resistivity meter and a semi-adiabatic apparatus respectively.Free linear change and strength development of the corresponding mortars under drying and water curing conditions were studied;and the initial cracking time of mortars cured at drying conditions was detected using a five-group crack apparatus.The results show that the SRA retards early hydration of cement pastes at normal temperature but accelerates early hydration at semi-adiabatic conditions.The SRA mortars cured in drying conditions show a lower linear shrinkage value,a lower strength development and a later initial cracking time.However,the SRA mortars cured in water show a higher shrinkage at earlier ages and consequently SRA may not be able to control thermal cracking.The results indicate the SRA has physical and chemical effects in cement-based materials.
【Fund】: 硅酸盐材料工程教育重点实验室(武汉理工大学)开放课题基金资助项目(编号:SYSJJ2005-08)
【CateGory Index】: TU528.042.2
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