Influence of Water to Cement Ratio and Fineness on the Autogenous Shrinkage of Cement Paste

【Author】

P.Gao;R.F.Luo;T.S.Zhang;J.X.Wei;Qijun Yu;

【Abstract】

<正>The influences of water to cement(W/C) ratio and fineness on the autogenous shrinkage of cement paste were investigated Cements with different fineness were classified from a commercial Portland cement by an air-classifier in the laboratory.The autogenous shrinkages of cement pastes were measured by a non-contact corrugated method To illustrate mechanism of autogenous shrinkages of cement pastes,the chemical shrinkages,pore structures and hydration degrees of cement pastes were measured by the volumetric method,non-evaporable water method,and Mercury Intrusion Porosimetry(MIP),respectively. The results show that the autogenous shrinkage of cement paste increases with the decrease of W/C ratio.For cement pastes of normal consistency,the autogenous shrinkage increases with the decrease of cement fineness.The paste prepared by cement with a D50 of 7.13μm presents the lowest change ratio of autogenous shrinkage to hydration degree after 3 d. Originality The control of cement particle size distribution is a potential method proposed recently to mitigate the autogenous shrinkage of cement-based materials.The influence of W/C ratio on the autogenous shrinkage of cement paste with different fineness is fundamental to the control of cement particle size distribution,which was rarely reported in literature but discussed in this study.The results show that the paste prepared by cement with a D50 of 7.13μm(medium diameter) has the lowest autogenous shrinkage to hydration degree after 3 d and is beneficial to the control of cement particle size distribution in engineering.

【Keywords】

auotogneous shrinkage;;fineness;;particle size distribution;;water to cement ratio

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