人们都认为用混凝土建造的房屋、桥梁、大坝、护岸等是很坚固的。可是有的建筑物、构筑物建成后没有几年,表面混凝土剥落,钢筋锈露。这是什么原因呢?据有关专家分析,混凝土碱—集料反应的是造成混凝土破坏的原因之一。 People think that concrete-built houses, bridges, dams, revetments, etc. are very strong. However, some buildings and structures were not built for several years after the completion of the construction. The surface concrete was peeled off and the steel bar was rusted. What is the reason for this? According to the analysis of experts, concrete alkali-aggregate reaction is one of the causes of concrete damage.