社会資本整備の低炭素化に向けた「社会資本LCA」の開発状況と今後の展望

抄録

Objective. We report the development process and future prospects of “Infrastructure LCA” that National Institute for Land and Infrastructure Management, NILIM in Japan, has developed.

Results and Discussion. Infrastructure LCA is a methodology to calculate the CO₂ emissions associated with social structure improvement. The characteristics of this method are the following:（1）this method consists of environmental impact formulas and environmental load units,（2）the formulas and load units are constructed at each stage of the decision-making of infrastructure development,（3）types of load units of construction materials are various. By using the Infrastructure LCA, we have calculated that the CO₂ emissions of a tunnel construction can be reduced by 3% by exchanging from conventional construction technology to low-carbon construction technology. Also we have estimated to reduce approximately 300,000 tons of CO₂ emissions without additional expenses by spreading 26 low-carbon construction technologies to various the social structure constructions. At the present, we are supporting builders and administrative officers through the dissemination of Infrastructure LCA. In the future, we are planning to study for more convenient Infrastructure LCA and to develop the calculation methods of CO₂ emissions in service stage of infrastructure.

Conclusions. NILIM has developed Infrastructure LCA, a methodology to calculate the CO₂ emissions of infrastructure. Previous studies have confirmed effectiveness of Infrastructure LCA. We plan to study of the spread and the advancement of Infrastructure LCA.