THE DESIGN AND EVALUATION OF STRATEGIC SCENARIO FOR PRODUCT-CHAIN-MANAGEMENT OF BUILT ENVIRONMENTS

The accumulation of the urban structure accompanied by economic growth brings a great environmental impact to a city and a nation as a construction by-product after the time lag about a half-century. In Japan, the quantity of the waste discharged from construction industry reaches about 100 million ton, and it is expected that their by-product will increase sharply in the near future by demolition of structures built at the high economic growth age. This has been a serious environmental subject also in many cities of developing countries including Asia where the rapid urbanization accompanied by economical development progresses from the end of the 20th century. Therefore, it is pressing need to promote recycling of a higher rank more and to construct circulated society.The authors present the material-product chain management system of construction stocks from national scale viewpoint. Hierarchical recycle system for built environments are proposed. Secondly, authors focus on the urban scale recycling system for construction materials. Finally, planning scenarios and options for ecologically efficient urban environments and estimation systems are also presented.