Assessment of theResearch Paper Impact on Future Construction Material Inflow and CO2 Emissions due to Changes in the Retention Time of Buildings

Abstract

Buildings and infrastructures require a large amount of construction materials and the strategic management of those material stock accumulated in urban structures is very important to realize decarbonized society and material-cycle society. This study aims to estimate the amount of material stock and flow of buildings in the entire Japan and evaluate the impact of lifespan extension of buildings on the future material circulation and CO2 emissions. As results, it was found that the scenario expecting the lifespan extension of in-use stocks, the amount of CO2 emissions in 2100 will be reduced by about 50% compared with the scenario which keeps the current lifespan of buildings. On the other hand, there were no differences among scenarios due to the management of the obsolete stock.