一、我国商品混凝土的发展现状商品混凝土从七十年代末进入我国以来,已经在近三十座大、中城市得到了不同程度的应用。至1989年,全国商品混凝土厂站的年生产能力已达900万m~3;实际年产量450万m~3左右,约占全国城市混凝土现浇量的7%。我国商品混凝土的生产能力分布比较集中,北京、上海占很大比例,除此之外分布在一些省会和沿海大、中城市。1989年上海市拥有商品混凝土厂 First, the development of China’s commercial concrete status Since its entry into China in the late 1970s, commercial concrete has been applied in varying degrees in nearly 30 large and medium-sized cities. By 1989, the annual production capacity of commodity concrete plant stations nationwide had reached 9 million m 3 ; the actual annual output was about 4.5 million m 3 , accounting for about 7% of the total amount of urban concrete poured into the country. The distribution of production capacity of commercial concrete in China is relatively concentrated, with Beijing and Shanghai accounting for a large proportion, in addition to some provincial capitals and coastal large and medium-sized cities. In 1989 Shanghai owned commercial concrete plant