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(一)无砂混凝土的发展概况无砂混凝土是由水泥、粗骨料(碎石、卵石或轻骨料等)和水拌制而成的一种大孔混凝土。国内外主要用它作住宅的墙体。早在19世纪,这种混凝土已在欧洲出现。最早使用它建造房屋的是英国,1952年英国用粗砾石和水泥建造了两幢房屋。无砂混凝土技术的推广对二次大战后英国、德国、苏联、荷兰、法同等国家的住宅建设,起了重大作用。在德国一座大厦的下部6层
(1) Development of Sandless Concrete The sand free concrete is a kind of large-pore concrete made of cement, coarse aggregate (crushed stone, pebble, or light aggregate, etc.) and water. It is mainly used as a residential wall at home and abroad. As early as the 19th century, this kind of concrete appeared in Europe. The earliest use of it for building houses was in the United Kingdom. In 1952 the United Kingdom built two houses with coarse gravel and cement. The promotion of sand-free concrete technology has played a major role in the construction of houses in countries like Britain, Germany, the Soviet Union, the Netherlands, and France after the Second World War. The lower 6 floors of a building in Germany