|In connection with the proper disposition of construction byproducts,
which has come to be treated in recent years as a serious national issue,
recycling laws have been enacted and various initiatives primarily designed
to promote recycling activities have grown in scope, as typified by the
formulation by the Ministry of Land, Infrastructure and Transport of the
Construction Recycling Promotion Plan 2002.
In taking a lead in this area, the Public Works Bureau began operations
of a soil modification plant in Osaka City in 1983. Many years later,
it continues to process surplus soil.
The improved soil generated by this plant is arrived at by crushing and
mixing together construction generated soil and debris (commonly concrete
molds) produced in the course of road and other types of construction
jobs ordered by the Bureau and 1% calcium oxide. The improved soil can
be used as pavement material (mainly for laying the roadbed and for filling
and backfilling purposes).