01090786

Component

Environmental and economic factors are increasingly encouraging higher value utilization of demolition debris. While the use of waste concrete aggregate (WCA) is mainly confined to low-grade application, it would be more beneficial if good-quality concrete can be produced with demolished concrete for new concrete construction. Hence, an experimental study was undertaken to explore the feasibility and potential of using field-demolished concrete as full replacement of natural aggregates to produce high strength concrete (HSC), as reported in this paper. The workability of fresh concrete and mechanical properties of hardened concrete made with WCAs were investigated. The preliminary results indicated that HSC with up to 80 MPa of 28-day compressive strength made with field-demolished concrete as coarse aggregates and natural sand as fine aggregates can be obtained with the facilitation of a modified mixing method and addition of silica fume. By providing a general basis for evaluating demolished concrete as aggregates for good-quality concrete, the investigation reported herein should contribute significantly to the understanding of recycled aggregate concrete (RAC) as a viable option in the HSC construction industry.

01084478

08-1752

English

9p

2008

Transportation Research Board 87th Annual Meeting

DVD

Figures (4) ; References (29) ; Tables (1)

Compressive strength; Demolition; Fresh concrete; High strength concrete; Mechanical properties; Recycled materials; Silica fume; Waste products (Materials); Workability

Hardened concrete; Recycled aggregate concrete; Waste concrete aggregate

Highways; Materials; I32: Concrete

Transportation Research Board Annual Meeting 2008 Paper #08-1752

TRIS, TRB

Jan 29 2008 4:06PM