目前,我国混凝土外加剂产品大部分都有国家或部标准,只有混凝土防冻剂至今尚未制订标准。这样,给防冻外加剂生产厂家及用户带来了不便,不知究竟以什么标准来判断防冻剂的质量。以前,有人以掺防冻剂混凝土静停2～4 h后冻28d加标养28d强度为依据。1989年全国冬期施工会议上,有的代表提出以静停4h后冻7d加标养28d强度作为防冻剂的检验标准。不管以何种方法为标准,都有一个静停时间为前提,但究竟静停时间以多少为好,没有具体标准。当前,在全国特别是在华北地区,混凝土冬期施工不但掺防冻剂,而且普遍采用综合蓄热法,混凝土构件从成型到蓄热完毕都保持 At present, most of China’s concrete admixture products have national or ministry standards, and only concrete antifreeze has not yet set standards. In this way, it has caused inconvenience to manufacturers and users of antifreeze admixtures, and they do not know what criteria to judge the quality of antifreeze. In the past, it was based on the strength of concrete mixed with antifreeze concrete for 2 to 4 hours after freezing and 28d for freezing and standard strength for 28 days. At the National Winter Construction Conference in 1989, some representatives proposed freezing and 7d plus standard 28d strength as an antifreeze test after 4 h of static stop. Regardless of which method is used as the standard, there is a static stop time. However, the number of static stops is better, and there is no specific standard. At present, in the whole country, especially in North China, the winter construction of concrete not only incorporates antifreeze, but also adopts a comprehensive heat storage method. Concrete components are kept from forming to heat storage.