earticle

영어

This research examines basic property of sub-slab concrete mixed with recycled coarse aggregate, according to different unit quantity, replacement ratio of fine and coarse aggregate, BFS, and FA; the purpose is to encourage use of recycled aggregate. In case of fresh concrete, the fluidity increased along with the replacement ratio for recycled coarse aggregate; the air volume became larger in mixed concrete than in plain as the replacement ratio for recycled coarse aggregate increased. Mass for unit volume declined with the increasing replacement ratio. As for hardened concrete, compressive and tensile strength of mixed concrete reached over 80% of plain concrete, up to the replacement ratio of 30%. For drying shrinkage, the change in length became greater for mixed concrete than for plain as the replacement ratio increased.