在《建筑材料学》中,一般都介绍有混凝土因选材不当而出现碱——骨料膨胀反应一事,但实例较少。最近,在上海市某变电站的大型主变压器(重量超过150吨)的混凝土基础上出现了大块爆裂、崩开现象,局部甚为严重。该基础已建成近两年,幸尚未安装上设备,否则将造成重大事故。现虽缺可供参考的混凝土原始用材资料,但从取样试验知其碱度值尚高,分析认为主要是由于碱——骨料反 In “Building Materials Science”, it is generally stated that there is alkali-aggregate swelling reaction due to improper selection of concrete, but there are few examples. Recently, massive bursting and collapse occurred on the concrete foundation of a large-scale main transformer (over 150 tons in weight) in a substation in Shanghai. The foundation has been built for the past two years. Fortunately, no equipment has been installed. Otherwise, it will cause major accidents. Although there is no reference to the original concrete material for reference, the basicity value of the concrete is known to be high from the sampling test. The analysis is mainly due to the alkali-aggregate reaction.