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水泥外加剂在砂浆或混凝土拌和时或拌和前加入,能按要求改变、提高混凝土性能,是近二、三十年内迅速发展的一项新技术,它在大型钢筋混凝土工程中的应用日趋增加。能满足水泥阻锈和防冻性的外加剂,一般常用氯化钠、氯化钙和亚硝酸钠等,但其对混凝土中的钢筋有腐蚀作用,国外一些桥梁、车库、大楼的损坏即由水泥中盐和电解作用所起的腐蚀所致。
Cement admixtures are added during the mixing of mortar or concrete or before mixing, which can change and improve the performance of concrete as required. It is a new technology that has been rapidly developed in the last two to three decades. Its application in large-scale reinforced concrete projects is increasing day by day. The admixtures that can meet the rust and frost resistance of cement are commonly used in sodium chloride, calcium chloride, and sodium nitrite, but they have corrosion effects on reinforcing steel in concrete. Some bridges, garages, and buildings in foreign countries are damaged by cement. Corrosion caused by salt and electrolysis.