An Experimental Study on the Workability and Engineering Properties of Recycled Aggregate Concrete Mixed Fly ash. - Part 1. In the case of fresh concrete -

플라이애쉬를 혼입한 재생골재의 시공성 및 공학적 특성에 관한 실험적 연구 -제 1보 아직 굳지않은 콘크리트의 성상을 중심으로-

Recycling of waste concrete will contribute not only to the solution of a growing waste disposal problem, also help to conserve natural resources of aggregate and to secure future supply of reasonably priced aggregates for building construction purpose within large urban areas. But there recycled aggregates are more porous and less resistant to mechanical actions. In comparison with natural aggrete concrete, recycled aggregate concrete shows reductions in strength and other engineering properties. And it may also be less durable due to increase in porosity and permeability. Economical ways of improving the quality of recycled aggregate concrete are: (1)by reducing the water-cement ratio; (2)by reducing the water content using a superplasticizer without affecting the workability; (3)addition of pozzolan, such as fly ash; and (4)blending of recycled aggregate with the natural aggretes.