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混凝土是基本建设中应用最为广泛的一种建筑材料,具有以地方材料为主、制作简单、造型方便、坚固耐久、维修费用低、能耗少等优点。随着我国经济建设步伐的加快,混凝土得到了前所未有的快速发展。1994年我国水泥产量达3.63亿吨,混凝土年使用量约20亿吨,居世界之首。 国内外的工程实践表明,混凝土性能的改善及其施工技术的进步与应用混凝土外加剂紧密相关。工业发达的国家已在一半以上（有的达90％以上）的混凝土中应
Concrete is one of the most widely used building materials in basic construction. It has the advantages of local materials, simple production, convenient shape, strong durability, low maintenance costs, and low energy consumption. With the accelerated pace of economic construction in our country, concrete has achieved unprecedented rapid development. In 1994, China’s cement output reached 363 million tons, and the annual concrete usage was about 2 billion tons, ranking the first in the world. The engineering practice at home and abroad shows that the improvement of concrete performance and the progress of construction technology are closely related to the application of concrete admixtures. Industrially-developed countries should already have more than half (some more than 90%) of concrete