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当今,日本新干线上许多高架桥的混凝土表面裂缝之所以日趋严重,其主要原因是由于水泥中的碱与骨料中的二氧化硅发生化学反应。及早发现和处理碱—骨料反应,这将是减少混凝土受损害和防止裂纹扩大的有效手段。日本有关部门的材料研究室,先后通过对多种建筑物的调查以及在实验室做碱—骨料反应的再现试验后确认:混凝土发生老化变质,是由于混凝土中产生了反应生成物。至于其判断方
Today, the cracks in the concrete surface of many viaducts on the Shinkansen in Japan are becoming increasingly severe. The main reason is that the alkali in the cement chemically reacts with silica in the aggregate. Early detection and treatment of alkali-aggregate reactions will be an effective means to reduce concrete damage and prevent crack growth. The Material Research Laboratory of the relevant Japanese department has successively confirmed the investigation of various buildings and the reproducibility test of the alkali-aggregate reaction in the laboratory. It was confirmed that the aging and deterioration of the concrete occurred due to the reaction products generated in the concrete. As for its judgement