Construction materials account for 48% (1.1 billion tons (1995)) of all material flow in Japan. Most of these materials are accumulated in cities as stock. In the near future, the stock will cause the new material flow as wastes. In the present study, MFA (material flow analysis) is applied to Kitakyushu City, and the material stock used for construction and roads is quantified via GIS (geographical information system). The change in material flow is then estimated for the near future. The main results obtained herein are as follows: (1) The amount of material stock for construction and roads was 74 million tons in 1995. (2) In 2020, the amount of overage stock is expected to become 1.4 million tons.
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