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。 Recycled coarse aggregate prepared from abandoned C15 concrete block was used to mix concrete partially or totally, and the effect of replacement ratio of recycled coarse aggregate on the workability and compressive strength of concrete with different strength classes was discussed. The results show that: the replacement rate is smaller, the workability of concrete is improved, but larger will cause the slump of concrete to decrease. When the replacement rate increases, the compressive strength of low-grade concrete increases slightly, and the compressive strength of middle- and high-grade concrete gradually decreases.