Manufacture of very Low-grade Concrete using Demolished Concrete Debris and Industrial By-products for the Purpose of Minimizing the Environmental Load
By Y. Ishikawa, T. Sakurai, H. Kimura and Y. Sakazume
Concrete Journal, Vol.45, No.8, Aug. 2007
- Synopsis
- Until recently, most of the concrete debris obtained by the demolition of concrete structures has been used as base course materials. In recent years, more and more volumes of such debris are used as concrete aggregate after being subject to advanced treatments, which remove the mortar from the surface of the aggregates. This report provides a technical proposal of a new recycling method using the demolished concrete debris and industrial by-products with the purpose of minimizing the environmental load and provides a technical statement on the results of this method adopted in practice in a concrete construction work. The technical proposal provides the application method for the low-grade concrete with a compressive strength of several N/mm2 while enabling the effective use of industrial by-products. An adoption of these technical proposals in an actual site allowed not only the manufacture and use of concrete satisfying the target quality, but also the realization of recycling of approximately 11,500 tons of demolished concrete debris and significant reduction of the environmental load.
- Keywords:
- reduction of the environmental load, demolished concrete debris, indusrial by-products, very low-grade concrete
