一、概述混凝土掺防冻剂的主要目的是使混凝土在负温下达到预期的强度,不使混凝土遭受冻害。目前冬季用防冻外加剂普遍都由减水剂、早强剂、引气剂和防冻剂四种外加剂复合,相互补充各自特点,取长补短,以发挥更好的效果。减水剂的作用是使混凝土拌合物减少用水量,从而减少混凝土中含冰量,并能使冰晶粒度小且分散,减少了对混凝土的破坏应力。早强剂是在混凝土有液相存在 I. Overview The main purpose of concrete admixtures is to achieve the desired strength of the concrete at negative temperatures without freezing the concrete. Currently winter antifreeze additives are generally superplasticizer, early strength agent, air entraining agent and antifreeze four admixtures, complement each other’s own characteristics, learn from each other to play a better effect. The role of water-reducing agent is to make concrete mix to reduce water consumption, thereby reducing the amount of ice contained in concrete, and can make the ice crystal small and dispersed, reducing the stress on the destruction of concrete. Early strength agent is in the presence of liquid concrete