基于成熟度理论的低温养护混凝土强度预测模型

Strength Prediction Model of Low Temperature Curing Concrete Based on Maturity Theory

本文利用成熟度理论计算了标养(20℃)和低温(3℃)养护条件下混凝土的成熟度,分析了低温对混凝土强度增长的影响,研究了不同水灰比对低温养护混凝土强度预测模型的影响规律。分别利用指数函数模型、双曲函数模型、对数函数模型建立了标养条件下抗压强度—成熟度之间的关系,拟合了各个模型的参数,对比了不同模型之间拟合的准确性,其中利用指数函数模型、双曲函数模型表示标养条件下抗压强度—成熟度之间的关系可以达到很高的拟合精度。根据获得的抗压强度—成熟度模型来预测低温(3℃)养护条件下不同成熟度时的混凝土强度,并与实测值进行了比较,两个函数对混凝土前期强度预测准确性较差而对后期强度预测较准确。

Maturity of the concrete under the standard curing（20℃）and low temperature curing（3℃）was calculated using the theory of maturity.Influence of low temperature on the strength of the concrete was analyzed,and influence of water to cement ratio on the prediction model of low temperature curing strength was also studied.Relationship between compressive strength and maturity of standard curing concrete was established using exponential function model,hyperbolic function model and logarithmic function model,respectively.In the processes,parameters of each model were fitted,and the accuracy of the fitting of these models was compared.Relationship between compressive strength and maturity of standard curing achieved a good degree of fitting using exponential function model and hyperbolic function model as well.Exponential function model and hyperbolic function model were used to predict the strength of the concrete cured at low temperature（3℃）with the same maturity.As compared with the measured strengths and from the strength point of view,the two functions work better in the prediction of strength of concrete in short-time curing than that for long-time curing.