Hirokazu Shima, Hisashi Tateyashiki,
Ryuji Matsuhashi and Yoshikuni Yoshida
Journal of Advanced Concrete Technology, 3(1) 53-67, 2005
While at present mostly recycled into road
subbase, the amount of demolished concrete in Japan is expected to increase rapidly
and exceed the demand of road subbase in the near future. To promote the recycling
of concrete, a technology to produce high-quality recycled aggregate has been developed.
This technology employs the heating and rubbing method. In order to investigate a
future concrete recycling system, first of all, a specific model considering indices
of economic activity is established to forecast the amount of demolished concrete
in the future. Furthermore, an input-output table is extended by a detailed description
of concrete-related industries such as construction, aggregate, cement, and ready-mixed
concrete, and several concrete recycling processes have been added.The linear programming
model connected to the input-output table assumes that the technology to be introduced
in 2020. A subsidy for the high-quality recycled aggregate and a carbon tax are found
to be effective to the early introduction of the technology.