STUDY ON MATERIAL CYCLE OF CONCRETE WASTE FROM BUILDING DEMOLITION : Impurities affecting concrete-waste recycling and their adverse effects

Abstract

The objective of this study is to clarify the key points for better recycling of the concrete waste from building demolition, based on surveys in the fields of waste disposal and building demolition. The results showed that the impurities contained in concrete waste form major obstacle to better recycling, even causing increased C0_2 emission. The removal of them should be considered in the previous stages to waste disposal. It was suggested that further efforts should be made for easier removal of plastics, glass. copper (electric wire, piping etc.) and ceramics in demolition process and of plastics and copper in designing process ; and in view of components, for easier removal of finishing materials and various fixtures in demolition process and of the fixtures in designing process.