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《Cement》 2010-01
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Study on shrinkage of cement paste in early hydration age

XU Wei,HUANG Yun,LIN Zong-shou Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education, Wuhan University of Technology, Wuhan 430070, Hubei, China  
An experiment instrument was developed to measure the shrinkage of cement paste by a high sensitivity linear volt differential transfer (LVDT) sensor. The autogenous shrinkage and drying shrinkage of different cement pastes with different ratio of water to cement (W/C) and different admixture were studied by this instrument. The results showed that the shrinkage process of cement paste could be measured precisely and continuously by this instrument after final setting. The autogunus shrinkage and drying shrinkage increased as W/C decreased in early hydration age. The autogenous shrinkage of cement paste was about 10% of drying shrinkage under 20℃ and RH 50% curing condition. The fly ash could be used to reduce the autogenous shrinkage and drying shrinkage of cement paste slightly, while mixing limestone powder or GGBS increased the early shrinkage of cement paste in different degrees.
【CateGory Index】: TU528
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