建設副産物のリサイクルに関わる物質フローと環境負荷の算定手法に関する研究

点击翻译按钮获取中文摘要

This study analyzed the mass-flow of material and waste in individual industrial regions to evaluate a material flow model encompassing the larger industrial area. The regions included 25-40 Japanese prefectures in 1994. We used the emission rate of total or industrial waste as an environmental loading item, in order to create an indicator capable of evaluating regional sustainability. Generation of industrial waste was also compared in each industrialcategory. The relationships between total waste volume and the total material input of the objected prefectures imply that total waste corresponds to nearly 10% of the total material input generated in every prefecture. An optional scheme of road paving maintenance was investigated by examining the environmental loading and cost considerations of pavement operations over a 30-year life cycle. Results indicated that the application of recycled materials in pavement construction and repair reduced the effects of environmental loading over the life cycle by approximately 40%. Furthermore, it was observed that environmental loading conditions associated with the maintenance repair stage of asphalt paving comprised 50% of the total environmental loading determined for the 30-year life cycle. Conversely, costs of the maintenance repair stage were 40% of the total life cycle costs. Finally, results suggest that environmental load and cost considerations will be improved and made more efficient over a life cycle period if a regular maintenance routine of simple asphalt repairs is established.