废弃混凝土再生粗骨料对混凝土性能的影响

Effect of waste concrete recycled coarse aggregate on properties of concrete

用废弃C15混凝土试块制备的再生粗骨料部分或全部替代碎石拌制混凝土,探讨了再生粗骨料替代率对不同强度等级混凝土和易性和抗压强度的影响。结果表明:替代率较小时对混凝土和易性有所改善,但较大时会引起混凝土坍落度下降。当替代率增大,低等级混凝土抗压强度略微增加,中高等级混凝土抗压强度逐渐下降。

C15 waste concrete blocks were prepared to produce the recycled coarse aggregate, and it replaced gravel in concrete partially or com- pletely. The effect of recycled coarse aggregate replacement rate on the workability 仙d compressive strength of differentwere investigated. The results showed that low replacement rate improved workability of concrete, high replacement rate reduced the slump of concrete. The compressive strength of low strength grade concrete slightly increased with the replacement rate increases, but the compressive strength of mid or high strength grade concrete decreased.