负温下现浇混凝土养护温度和强度的实测

从多个采用人工冻结工法施工的混凝土结构工程的实际检测结果,分析了在负温环境条件下,现浇混凝土由于自身水化热的影响,使得混凝土的养护小环境处于正温条件下,同时,混凝土强度的增长规律也有所不同,混凝土的强度还是可以在后期达到设计要求的。提出低温条件下混凝土施工的限制条件不能单一地用一个环境温度作为指标,而要同时考虑混凝土自身的水化热作用

THE FIELD TEST ON TEMPERATURE AND STRENGTH OF CAST-IN-SITE CONCRTETE UNDER NEGATIVE TEMPERATURE ENVIRONMENT

In this paper, some of field test results about the hydration heat, concrete strength and temperature field of cast-in-site concrete under negative temperature curing environment with the artificial freezing method are presented. The results show that the concrete strength has grown within a limited rang of positive temperature environment caused by hydration heat. Though the law of the growth of concrete strength is different from that under standard curing temperature, the demands of design can be met later. Emphasis is laid upon the curing environment temperature. Meanwhile, attention must be paid to the imfluence of hydration heat.