PUBLIC WORKS BUREAU > Recycling Operations > Surplus soil recycling
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Recycling Operations
Surplus soil recycling

Surplus soil recycling
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).
Recycling of waste soil leads to:
  1. Extend the existing dumping yards life;
  2. Efficiently utilize the natural resource;
  3. Prevent the environmental demolition caused by excavation of pit soil and gravel;
  4. Mitigate traffic congestion as a result of shortened conveyance distance of waste soil;
  5. Save disposal costs as well as material costs of road construction; and
  6. Ensure the stable supply of construction material.
Soil Improvement Process ( PDF 98.4KB )
Quality of Improved soil ( PDF 86.5KB )
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