关键词: 低热水泥; 混凝土; 早龄期强度; 养护温度; 成熟度;

Abstract: To analyze the effect of curing temperature on early age strength of low heat cement concrete, the compressive strength, splitting tensile strength and axial compressive strength tests for different test ages(3d, 7d, 14d, 28d) and different constant curing temperatures(5 ℃,20 ℃,40 ℃,60 ℃) were performed.Based on the maturity theory, the maturity index of each group of specimens were calculated.The logarithmic, exponential and hyperbolic functions were selected to fit the relationship between the strength parameter and the maturity index.The results showed that the higher the curing temperature was, the faster the strength of low heat cement concrete increased, but excessively high curing temperature was detrimental to the later development of concrete strength.The equivalent age equation recommended by Freiesleben and Pedersen, or Chinese specifications for hydraulic concrete construction(DL/T 5144-2015),and strength-maturity hyperbolic function can better describe the growth of strength parameters with the equivalent age.The research results can provide a basis for the prediction of the real early age strength property of low heat cement concrete at dam construction site.

Key words: low heat cement; concrete; early age strength; curing temperature; maturity;