本试验主要研究负温(-3℃)和低温(3℃)不同养护条件下，引气混凝土在7 d、14 d、28 d、56 d、84 d和112 d不同龄期内强度增长规律及引气混凝土在28 d、56 d、84 d和112 d不同龄期内渗透性能变化规律。通过与标准养护条件下相应龄期引气混凝土抗压强度及渗透性能对比，得出了不同养护条件下引气混凝土随龄期增长强度损失率及渗透性能增长率。结果证明，试验龄期内引气混凝土强度损失率范围负温和低温下分别是22.40%~41.00%、7.97%~18.26%；渗透性能增长率范围，负温下约为76.52%~114.35%，低温下则在12.34%~47.86%之间波动。同时对该引气混凝土渗透性及强度实验数据进行回归分析，得到不同养护条件下线性相关系数。数据显示，负温(-3℃)养护条件下引气混凝土线性相关系数小于低温(3℃)养护条件下引气混凝土线性相关系数，说明养护温度影响混凝土渗透性与强度的线性相关性。通过掌握渗透性与强度的辩证关系，可为冬季防水工程施工中耐久混凝土配合比设计提供理论支持及参考依据。
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.
参考文献
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