摘要：对比从不同强度等级原生混凝土得到的再生粗骨料的物理力学性质,并以工程实际配合比为基础,研究再生骨料取代率对新拌混凝土的工作性、力学强度和抗渗性的影响。结果表明:再生粗骨料的物理力学性能差于天然粗骨料的,原生混凝土的强度越高,其再生骨料的性能越好;再生骨料取代率越大,新拌混凝土的坍落度越小,流动性越差,但是保水性和粘聚性越好;再生骨料混凝土的力学强度和抗渗性均优于原生混凝土的。

关键词：再生骨料；混凝土；工作性；力学性能；渗透性

Abstract： By comparing the physical properties of recycled aggregates prepared from different strength grades of concretes， the influences of different replacement ratios of recycled aggregates on workability， mechanical property and permeability of fresh concretes were studied according to the practical proportion of engineering. The results show that the physical properties of recycled aggregates are worse than those of natural aggregates. The higher the strength of the native concretes is， the better the properties of the recycled aggregates are. There is a good coordination among a higher replacement ratio of the recycled aggregates and a smaller slump and poor liquidity of the fresh concretes， and the good water retention and adhesiveness can be obtained. The mechanical strength and permeability resistance of concretes with the recycled aggregates are higher than those of native concretes. 

Keywords: recycled aggregate； concrete； workability； mechanical property； permeability