The Research about Equivalent Coefficient of Infant Age Concrete under Low Temperature

摘要

The author researches on the law of infant age concrete strength development under low temperature and influence of complex factors, and sets up efficient and reliable mathematical predicting model to monitor the infant age concrete strength development under low temperature at construction site. The strength curves are derived though testing the infant age strength of C30 with different mixtures. The equivalent coefficients of 10%,20%,30%,40% strength ratio of different mixture design concrete under the curing temperature of 5℃、 10℃、 15℃ was analyzed on the basis of different strength curves. The equivalent coefficient curve of strength development under the curing temperature of 5～20℃ has been attained, which is m = 0.289 + 0.03726 t + 0.000036 t~2. This result is fit to predict the law of infant strength development of concrete within 10%～40% of C30 standard strength. The calculated results according to the formula fit with the experimental results so that the equivalent coefficient curve is reliable.