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In this paper, total strain and time dependent change of thermal expansion coefficient (TEC) under temperature history of cement paste with W/C=0.3,0.4,0.55 whose binder is normal Portland cement, moderate Portland cement and low heat Portland cement were investigated. In all conditions, a rapid reduction of TEC was observed in very early age and TEC showed the local minimum value around 12-18hour. After that, it gradually increased with reduction of moisture content. During that term, low heat cement could reduce this increment of TEC under high temperature history. This time dependent change of TEC could produce shrinkage as thermal strain with temperature dropping. The amount of this thermal strain is relatively large, and in the case of W/C = 0.4, low heat cement shows lower thermal strain.

EARLY AGE VOLUME CHANGING OF PORTLAND CEMENT PASTE UNDER HIGH TEMPERATURE HISTORY