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砼的冬季施工,由于负温条件的限制需要采取一些相应的措施,保证砼不受冻结,使强度,达到设计要求。所采用的措施中以化学外加剂最为简便。而选用那一种化学外加剂能达到予期效果,是要多方面衡量的,就技术性能而言,必须满足:①能降低水溶液的冰点;②对钢筋无锈蚀;③对砼强度及性能无影响。另外还需考虑的两个因素就是:成本低、货源广。建筑工程中通常使用的防冻剂有如下几种(表1、图1):
In winter construction, due to the limitation of negative temperature conditions, some corresponding measures need to be taken to ensure that the concrete is free from freezing and the strength is up to the design requirements. Among the measures adopted, chemical additives are the easiest. The choice of which chemical admixture can achieve the desired effect is measured in many ways. In terms of technical performance, it must satisfy: 1 It can reduce the freezing point of the aqueous solution; 2 It has no corrosion to the steel bar; 3 Has no effect on the strength and performance of the concrete. . Two other factors that need to be considered are: low cost and wide supply. Antifreezes commonly used in construction projects are as follows (Table 1, Figure 1):