An Experimental Study on the Properties of Lightweight Foamed Concrete According to the Replacement Ratio and Particle Size of Waste Concrete Powder

폐콘크리트 미분말 대체율 변화와 입도 변화에 따른 경량기포콘크리트의 특성에 관한 실험적 연구

The recycling of waste concrete is increasing for the environment protection and the shortage of aggregate according to the large scale construction project in Korea. The more manufacturing high quality recycled aggregate is produced, the more waste concrete powder generated from the manufacture process of recycled aggregate, and the consideration about the recycling of waste concrete powder is need. Waste concrete powder was used for the partial replacement of silica powder, which is a main raw material for the manufacture of autoclave foamed concrete. According to the results of research, the slurry density, flow, compressive strength mainly depend on the replacement ratio of particle size and waste concrete powder. At the SEM analysis, the more high-waste concrete powder was the less there are generated tobermorite. But we conclude that it is possible to replace WCP as silica source in the manufacture of the lightweight foamed concrete.