近些年 ,京津地区一些大型混凝土建筑如立交桥等 ,在远短于设计寿命期内就发生了严重损坏。国内外专家研究认为 ,这种现象主要是混凝土的碱集料反应造成的。这种碱集料反应被称为混凝土的“癌症” ,有效的预防措施是采用低碱水泥 ,降低混凝土中的碱含量。为提高混凝土质量 ,确 In recent years, some large-scale concrete buildings in the Beijing-Tianjin area, such as overpasses, have undergone serious damages far less than the design life. Experts at home and abroad think that this phenomenon is mainly caused by the alkali aggregate reaction of concrete. This alkaline aggregate reaction is called concrete “cancer.” An effective preventive measure is to use low-alkali cement to reduce the alkali content in the concrete. In order to improve the quality of concrete,