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国外为了加快施工速度,适应泵送混凝土需要,改善混凝土质量,在混凝土工程中采用了外加剂,而且使用量正在逐步增加。如英国12％、法国15％、苏联40％、西德50％、美国65％、日本80％的混凝土都采用了外加剂。国外已把外加剂作为配制混凝土不可缺少的组成材料之一。我国近年来也开始重视混凝土外加剂的推广应用。1970年前后,已把印染工业用的扩散剂引用于混凝土中,作为混凝土的减水剂,对提高混凝土质量,减少水泥用量,降低劳动强度,以及加快施工速度等方面取得了良好效果。在建筑
In order to accelerate the construction speed, adapt to the needs of pumping concrete, and improve the quality of concrete, foreign countries have used admixtures in concrete projects, and their use has gradually increased. For example, 12% in the United Kingdom, 15% in France, 40% in the Soviet Union, 50% in West Germany, 65% in the United States, and 80% in Japan use admixtures. Foreign additives have been used as one of the indispensable constituent materials for the preparation of concrete. In recent years, China has also begun to attach importance to the promotion and application of concrete admixtures. Before and after 1970, the diffusing agent used in the printing and dyeing industry was used in concrete as a water reducer for concrete, achieving good results in improving the quality of concrete, reducing the amount of cement, reducing the labor intensity, and accelerating the construction speed. In the building