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在建筑工地上,长期以来混凝土是采用一种自给自足的生产方式。这种生产方式大大地限制了混凝土生产技术的发展,有许多弊病。近二十年来,许多国家发展由工厂集中搅拌的商品混凝土,取得了很好的效果。目前在一些国家里,建筑工地所用现浇混凝土已有三分之二采用商品混凝土,特别在大城市里,商品混凝土的量达到现浇混凝土总量的70～80％。我国随着建筑工程量的不断增加和建筑材料的改
On construction sites, concrete has long been used as a self-sufficient production method. This production method has greatly limited the development of concrete production technology and has many drawbacks. In the past two decades, many countries have developed commodity concrete that has been intensively mixed by factories, and have achieved very good results. At present, in some countries, about two-thirds of the cast-in-place concrete used in construction sites is used for commercial concrete. Especially in large cities, the amount of commercial concrete reaches 70-80% of the total amount of cast-in-place concrete. With the continuous increase in the number of construction projects and the change of building materials in China