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三井建设公司开发成功抑制作为混凝土劣化主要原因的碱骨料反应的新技术。该技术对混凝土添加无机系的离子交换体,通过对碱金属离子交换和固定以抑制反应,目的在于无需补修而从根本上防止劣化。具体开发是在以易起反应的硼硅玻璃为骨料的混凝土中添加多种抑制候补材料,分析棒状供试体(材令12周)的膨胀比。结果发现添加3％的含水氧化锑时显示出0.009的膨胀比,比合成沸石系材料有高二位数的抑
Mitsui Construction Co., Ltd. has developed a new technology that successfully suppresses the alkali-aggregate reaction that is the main cause of concrete deterioration. This technique adds inorganic ion exchangers to the concrete and suppresses the reaction by ion exchange and immobilization of the alkali metal so as to fundamentally prevent deterioration without the need for repairs. The specific development was to add various inhibitory candidate materials to the concrete made of readily borosilicate glass-reinforced concrete, and to analyze the expansion ratio of the rod-shaped test specimens (12-week material order). As a result, it was found that the addition of 3% yttria containing yttrium showed a swelling ratio of 0.009, which was a higher double-digit than that of synthetic zeolite materials.