Product Chain Management of Building Materials and its Life Cycle Assessment

Urban material stock as buildings, housesm, and infrastructures, are to tranformed into large amount of environmental impact of solid wastes and greenhouse effect gas. A large number of buildings and facilities constructed in rapid economic growth decades after World War Two are supposed to face abrupt finish from both of social demand and physical function standpoints. This paper propose hierarchical material management system for building materials, namely wood, concrete, and steel, based on the national scale material flow survey of three principal building materials.Several recycle scenarios for woods are preliminarily designed and its effects are estimated as well as those effects in Osaka City.