中国的预拌混凝土行业起始于20世纪70年代末期,20世纪90年代开始获得蓬勃发展。它是现代混凝土技术发展史上的重大进步,是建筑施工走向现代化的重要标志,是混凝土生产由粗放型生产向集约化大生产的转变,实现了混凝土生产的专业化、商品化和社会化。不论按体积还是按重量计算,混凝土都是结构工程材料中占有比重最大的材料。我国建筑工程不仅体量巨大,而且高层和超高层建(构)筑物、大型和超大型桥梁、隧道、港口、大坝等施 The ready-mix concrete industry in China started in the late 1970s and began to flourish in the 1990s. It is a significant progress in the development of modern concrete technology, an important symbol of the modernization of construction, a shift from extensive production to intensive large-scale production of concrete production, and the specialization, commercialization and socialization of concrete production. Whether by volume or by weight, concrete is the largest proportion of structural engineering materials. The construction of our country is not only huge in quantity, but also high-rise and super-high-rise buildings, large and very large bridges, tunnels, ports, dams and other facilities