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混凝土防冻剂包括防冻组分、减水组分、引气组分和早强组分,他们的作用分别是:
1、防冻组分可改变混凝土液相浓度,降低冰点,保证混凝土在负温下有液相存在,使水泥仍能继续水化。
2、减水组分可减少混凝土拌合用水量,从而减少了混凝土中的成冰量,并使冰晶粒度细小且均匀分散,减小对混凝土的破坏应力。
3、引气组分是引入一定量的微小封闭气泡,减缓冻胀应力。
4、早强组分是能提高混凝土早期强度,增强混凝土抵抗冰冻的破坏能力。
亚硝酸盐一类的阻锈剂可以在一定程度上防止氯盐对钢筋的锈蚀作用,同时兼具防冻与早强作用。
使用方法:
混凝土原材料应满足《钢筋混凝土工程施工及验收规范》的要求。水泥:宜采用普通硅酸盐水泥,也可采用矿渣硅酸盐水泥。水泥出厂期不得超过两个月。骨料:所用砂、石质量应满足国标中有关冬季施工的要求,骨料内不得含有冰雪等冻结物,冻砂块需要打碎,过筛后使用。
砼搅拌时,要注意适当减少拌合用水,减水率可控制在10%左右,坍落度应控制在30mm以内。使用时需要辅助一定的保温措施,混凝土出罐温度不低于7℃。
新浇混凝土入模温度不低于5℃,成型后立即用了塑料布和1~2层草袋覆盖,加强新浇混凝土保温、保湿,养护时间不少于7天。
掺量为占水泥重量的5%。