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1概述我国2007年预拌混凝土的年产量预计约5.8亿立方米(2006年不完全统计数为4.8亿立方米),预制混凝土行业即将走出低谷,目前的总年产量约1.6亿立方米。水泥耗量已居世界首位,约为全世界水泥总产量的50%。然而,随着混凝土产量的持续增长,水泥耗量的不断上升,由于生产混凝土而直接带来的自然资源消耗过度,CO_2的排量的增加,由于耐久性问题带来的经济负担,结构提前退出服役期,对环境带来的压力也日趋严重。
1 Overview China’s ready-mixed concrete production in 2007 is estimated at about 580 million cubic meters (with an incomplete statistics of 480 million cubic meters in 2006), and the precast concrete industry is about to bottom out. The current total output is about 160 million cubic meters. Cement consumption has ranked first in the world, about 50% of the world’s total output of cement. However, as concrete production continues to grow, cement consumption continues to rise, consumption of natural resources directly due to concrete production is increased, emissions of CO 2 increase, and structures withdraw early due to the economic burden of durability problems During the service period, the pressure on the environment is also getting worse.