混凝土工程的工厂化,一般有两种途径。一种方法是工厂生产预制构件,再到现场拼制安装;另一种方法是工厂集中搅拌好混凝土,再用车辆运送到施工现场捣灌,用这种方法生产混凝土叫预拌混凝土。在五十年代,大多数国家致力于发展预制构件生产,预拌混凝土是在六十年代以后才蓬勃发 There are generally two approaches to the industrialization of concrete works. One method is to produce prefabricated components at the factory and then install them on the site. Another method is to concentrate the concrete in the factory and transport them to the construction site for transportation. The concrete is called ready-mixed concrete. In the 1950s, most countries devoted themselves to the development of prefabricated components. Ready-mixed concrete began to flourish in the 1960s.