近年来一些工业发达的国家,如美国、日本、西欧等国商品混凝土的生产和供应量已达全部混凝土使用总量60%以上,并已形成为一个新兴的工业部门。我国近年来在一些大中城市(如北京、上海、常州)和大型建筑 In recent years, some industrially developed countries, such as the United States, Japan, Western Europe, and other countries, have produced and supplied commodity concrete over 60% of the total amount of concrete used, and have formed an emerging industrial sector. In recent years, China has been operating in large and medium-sized cities (such as Beijing, Shanghai, Changzhou) and large buildings.