(一)现状加气混凝土虽自1889年问世,但直到1929年瑞典建筑师 Axel Eriksson 用高压蒸汽养护工艺改进产品性能后才有较快发展。半个多世纪来全世界已有四十多个国家生产,年产量总数在3300万米~3以上。然而近些年来有些国家,特别是北欧,受轻质陶粒混凝土(Leca)的竞争,颇有衰落之势,因而各国发展很不平衡。目前主要是一些欧洲国家,也包括亚洲的日本和我国在发展。现将几个主要国家的情况简述于后。 (a) The current situation Although the aerated concrete came out in 1889, it was not until 1929 that the Swedish architect Axel Eriksson had developed faster with the high-pressure steam curing process to improve product performance. For more than half a century, more than 40 countries have produced in the world, and the total annual output is between 33 million meters and 3 years. However, in recent years, some countries, especially in Northern Europe, have been declining due to competition from light-weight ceramsite concrete (Leca). As a result, the development of various countries is unbalanced. At present, it is mainly developed in some European countries, including Japan in Asia and China. The situation in several major countries is briefly described hereafter.