关键词: 再生混凝土;细观尺度;宏观性能;骨料;砂浆;界面过渡区

Abstract: Based on the current domestic and foreign scholars on the results of the performance of recycled concrete, the influence of aggregate, mortar and interfacial transition zone on the macroscopic properties of recycled concrete was studied.On the aggregate aspect, uniform distribution of aggregate, better gradation, the more medium aggregate, will improve the tensile strength, compressive strength, flexural strength and elastic modulus of recycled concrete.On the mortar aspect, the mechanical properties of recycled concrete will be improved with the strength of the new mortar and old mortar.The concentration of chloride in recycled concrete increases with the higher thickness of the old mortar.With the improvement of the strength of the new and old mortar, the mechanical properties of recycled concrete gets better.On the interface transition zone aspect, with the increase of the elastic modulus of the ITZ, the performance of the recycled aggregate concrete becomes better.The chloride diffusivity increases as the thickness of the ITZ zone increases.

Key words: recycled concrete;meso sacle;macroscopic property;aggregate;mortar;ITZ