一、前言冷天浇筑混凝土是一种冒险,因为早期冰冻会使混凝土受到破坏,即使混凝土不冻结,但低温也会造成混凝土凝固慢,养生期长,不能及时脱模,并且强度增长缓慢。为解决这些问题,通常在混凝土中加入氯化钙,使混凝土凝固加快并早强,但这不能阻止混凝土的冻结。在氯化钙的容许剂量(水泥重的2％)内,并不能将混凝土冻结点下降几度。若氯化钙用量大于2％,虽加快了混凝土的凝固,但氯化钙对钢筋的腐蚀 I. Introduction Cold pouring concrete is an adventure because early freezing can damage concrete. Even if concrete does not freeze, low temperature can cause the concrete to freeze slowly, have a long life span, and can not be released in time, and its strength increases slowly. In order to solve these problems, calcium chloride is usually added into the concrete to make the concrete to solidify faster and stronger, but this can not prevent the concrete from freezing. Within the allowable dose of calcium chloride (2% by weight of cement), it is not possible to lower the freezing point of concrete by a few degrees. If the amount of calcium chloride is greater than 2%, although the concrete to speed up the solidification, but corrosion of steel on calcium chloride