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一、概论自从1940年美国 T.E.Stanton 首先确定混凝土碱—集料反应(Alkali-aggregatereaction)这一重要的耐久性问题以来,很多国家不断出现 AAR 破坏事例,造成重大损失,因此受到人们愈来愈多的重视。近50年内世界上曾出现过三次热潮:50年代在美国、加拿大;70年代在南非、英国、北欧;80年代在日本,此外澳、新、德、意等国也有破坏事例。近3年来我国也开始发现 AAR 破坏现象,如果不立即采取有效措施,90年代第四次 AAR 热潮将落到我国头上。
I. Introduction Since the discovery of the important durability problem of the concrete alkali-aggregate reaction in the United States by TEStanton in 1940, many countries have continued to suffer from AAR damage cases and caused heavy losses. As a result, people have become more and more affected. The importance attached. In the past 50 years, there have been three crazes in the world in the 50s in the United States and Canada; in the 1970s in South Africa, the United Kingdom, and the Nordic countries; in the 1980s in Japan, and in other countries such as Australia, New Zealand, Germany, and Italy. In the past three years, China has also begun to discover the phenomenon of AAR destruction. If effective measures are not taken immediately, the fourth AAR boom in the 1990s will fall on our country.