我国近几年研制的冬期施工用外加剂,根据使用特点,一般是复合防冻剂(以下简称为防冻剂),即由减水、引气、早强、防冻等各组分组成,单一的防冻剂效果并不理想。在使用中又根据地区的气温选择用早强减水剂或防冻剂,如0～5℃温度在正负温交变地区可选择早强减水剂;低 The admixtures for winter construction developed in China in recent years are generally compound antifreeze (hereinafter referred to as antifreeze) according to the characteristics of use, that is, they are composed of various components such as water reduction, bleed air, early strength, and antifreeze. The effect of the agent is not ideal. In the use, according to the temperature of the area, use early strength water-reducing agent or antifreeze agent, such as 0～5°C temperature, choose the early strength water reducer in the positive and negative temperature alternating area;