摘   要：为实现建筑垃圾的再生利用和特细砂的大宗利用，将废混凝土再生粗砂、废砖再生粗砂分别与特细砂掺配，得到建筑垃圾再生混合砂，研究其对混凝土表观密度、和易性、抗压强度和劈裂抗拉强度的影响。试验结果表明，建筑垃圾再生混合砂替代天然砂配制混凝土，可达到设计和易性和强度要求，并有利于降低容重；废砖再生混合砂混凝土的韧性优于普通混凝土，而废混凝土再生混合砂混凝土的韧性劣于普通混凝土。

Abstract: In order to achieve the recycling of construction wastes and comprehensive utilization of super-fine sand, the construction wastes mixed sand is made by super-fine sand partly replaced by recycled concrete coarse sand or recycled brick coarse sand. The influences of construction wastes mixed sand on the apparent density, workability, compressive strength and tensile splitting strength of concrete are studied. Based on comparison tests, conclusions can be drawn that concrete using construction wastes mixed sand instead of natural sand can meet the standard of the workability and strength design while decreasing concrete unit weight. The toughness of recycled brick mixed sand concrete is better than that of common concrete. However, the toughness of recycled concrete mixed sand concrete is just on the contrary.