混凝土外加剂的使用已有五十年历史。随着土木工程和建筑施工的发展,出现了许多超大型的特种混凝土结构——高520米的预应力混凝土塔,跨度240米的大桥,高42米的卧式油罐,65,000吨的液化石油贮存加工船,海上混凝土钻采平台等,出现了许多新工艺——泵送流动混凝土,集中搅拌混凝 Concrete admixtures have been used for fifty years. With the development of civil engineering and building construction, there have been many very large special concrete structures - 520 meters high prestressed concrete towers, bridges spanning 240 meters, horizontal tanks 42 meters high, 65,000 tons of liquefied petroleum Storage processing vessels, offshore concrete drilling platforms, etc., there have been many new processes - pumped flow concrete, concentrated stirring coagulation