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一、混凝土的负温养护及其过程按现行钢筋混凝土工程施工及验收规范中第266条关于混凝土冬期施工气温的规定,当昼夜间的室外气温最低温度为3～0℃时,混凝土可用热水搅拌,并从将已浇注结构的外露部分加以覆盖时起,即作为负温养护。混凝土的负温养护应包括蓄热法养护和掺防冻外加剂负温混凝土综合蓄热法养护。当然也包含混凝土的早期受冻及处于冻结状态下的养护过程。负温养护的实质是在介质温度为负温度的自然条件下,创造正温养护环境,使混凝土获得凝结硬化过程。根据混凝土养护工艺原理,负温养护对混
I. Maintenance of negative temperature concrete and its process According to the provisions of the current construction and acceptance standards of reinforced concrete engineering in the 266th about the temperature of concrete during winter construction, when the nighttime outdoor minimum temperature is 3 ~ 0 °C, the concrete can be used hot water Stirring and curing from the exposed part of the poured structure, ie, as a negative temperature. The negative temperature maintenance of concrete shall include the conservation of heat storage method and the comprehensive heat storage method of negative temperature concrete mixed with antifreeze admixture. Of course, it also includes the early freezing of concrete and the curing process in a frozen state. The essence of negative temperature curing is to create a positive temperature curing environment under the natural condition that the medium temperature is a negative temperature, so that the concrete obtains a condensation hardening process. According to the principle of concrete curing process, negative temperature curing and mixing