美国是世界上应用混凝土小砌块比较早的国家,早在1890年小砌块就以商品形式出现在市场上,也是目前世界上应用小砌块比较广泛的国家之一,年产量约在35亿块左右(按标准块计,下同)。砌块是美国主要的建筑材料,约占墙体材料的80％。民用住宅、公用建筑,如体育馆、旅馆、商店、办 The United States is an early adopter of small concrete blocks in the world. As early as 1890, small blocks appeared on the market in the form of commodities, and it is also one of the countries in the world where small blocks are widely used. The annual output is about 35. About 100 million blocks (counted by standard block, the same below). Blocks are the main building material in the United States, accounting for about 80% of the wall material. Residential houses, public buildings, such as gyms, hotels, shops, offices