순환골재 미분말의 치환이 고유동 콘크리트의 유동성 및 재료분리 저항성에 미치는 영향

Abstract

This paper is to experimentally investigate the effect of recycled aggregate powder(RP) substitution methods and contents on the fluidity and segregation resistance of the high fluidity concrete with W/B of 35% and 700±100 mm of slump flow. The RP was substituted to cement and fine aggregates respectively ranged from 0~15%. An increase in RP substitution resulted in an increase of viscosity, thus, the segregation was prevented subjected to 5% of RP substitution to fine aggregate, while 15% of RP substitution to cement achieved desirable segregation resistance. Substitution of RP to fine aggregate up to 5% helped the concrete enhance the compressive strength compared to that of plain mixture. Within the sphere of the paper, it is believed that when RP is substituted to fine aggregates within 5%, segregation resistance as well as associated compressive strength can be enhanced.