The Influence of Mineral Admixtures on the Wear-resisting Property of Recycled Aggregate Concrete

摘要

It was tested the strength and wear value of recycled aggregate concrete mixing fly ash, slag, silica fume and double-mixture or three-mixture in deferent age. The results show that the wear value of recycled aggregate concrete mixing 30% fly ash is more than reference concrete at 3 days, but can improve final wear-resisting property significantly. The wear value of recycled aggregate concrete mixing 30% double-mixture of fly ash and silica fume is much lower than reference concrete at 3 days, and improve early wear-resisting property significantly. The flexural strength of the concrete is 4.26 MPa at 3 days, which can satisfy the traffic requirement. The wear value of recycled aggregate concrete mixing 30% three-mixture of fly ash, slag and silica fume is lower than reference concrete at 3 days, but the declining rate is not significant. It investigates mechanics of double-mixture technique which improves wear-resisting property at the same time.