关键词: 养护条件;龄期;引气混凝土;强度;渗透性

Abstract: This experiment mainly studies the rule about strength of air-entrained concrete in different age of 7 d、14 d 、28 d、56 d、84 d and 112 d and permeability of 28 d、56 d、84 d and 112 d under different curing conditions. By comparing the compressive strength and the permeability of the air- entrained concrete under the standard curing condition, the strength loss rate and the growth rate of the air-entrained concrete under ther different curing conditions were obtained. Test the age of air entraining concrete strength loss rate, minus temperature and low temperature was 22. 40%-41. 00%,7. 97%-18. 26%. Permeability growth rate range under minus temperature is about 76 . 52%-114 . 35%,12 . 34%-47 . 86% in the low temperature. At the same time ,by the air-entraining concrete permeability and strength experimental data regression analysis, linear correlation coefficient under different curing conditions are obtained. Data show that linear correlation coefficient under the conditions of minus temperature ( -3℃) is less than linear correlation coefficient under the conditions of low temperature ( 3 ℃) , which shows that temperature has an effect on linear correlation of concrete permeability and strength . According to the dialectical relationship between permeability and strength, it can provide theoretical support and reference for the design of concrete mix proportion of waterproof engineering in winter construction.

Key words: curing condition;age;air-entrained concrete;strength;permeability