对采用不同搅拌工艺的再生混凝土的宏观力学性能进行试验研究.采用纳米压痕技术和扫描电镜等设备研究了再生混凝土界面过渡区的纳观力学性能和微观结构特征.试验结果表明,采用普通搅拌工艺的新界面过渡区的弹性模量随着与老砂浆表面距离的增加而降低,但是采用二次搅拌工艺的弹性模量基本保持不变.老界面过渡区的弹性模量随着与天然骨料的距离增大而逐渐增加.采用二次搅拌工艺新的界面过渡区的微观结构较普通搅拌工艺的新界面过渡区更为致密,且孔隙率和氢氧化钙晶体含量较少.由再生混凝土的界面过渡区纳观力学性能和宏观抗压强度之间的关系,可知采用二次搅拌工艺可以改善界面过渡区的力学性能和微观结构,进而提高再生混凝土的宏观力学性能. The macroscopic mechanical properties of recycled concrete with different mixing process were studied.The nanocomposite mechanical properties and microstructure characteristics of the interface of recycled concrete were studied by means of nanoindentation and scanning electron microscopy.The results showed that using ordinary mixing The elastic modulus at the transitional zone of the new interface decreases with the increase of the distance from the surface of the old mortar, but the elastic modulus of the secondary agitation process remains unchanged.The elastic modulus of the transition zone of the old interface decreases with the increase of the elastic modulus of the natural bone The distance of material increases and increases gradually.The microstructure of the new interfacial transition zone of the secondary mixing process is more compact than the transitional zone of the new interface of the ordinary mixing process with less content of the porosity and calcium hydroxide crystals.The reclaimed concrete The results show that the mechanical properties and the microstructure of the interfacial transition zone can be improved by using the secondary mixing process and then the macroscopic mechanical properties of the recycled concrete can be improved.