关键词: 再生混凝土;芯样模型;界面结构;显微硬度;附着砂浆

Abstract: According to the characteristics of recycled concrete interface structure , a multi-interface reconstruction model is established .The microstructures of the transition zone of recycled concrete with different strength grades were analyzed , and the influence of the multi-interface structure of recycled concrete and its effect on the performance damage was researched .Increasing the strength grade of recycled concrete can effectively improve the microhardness of mortar matrix and the interface transition zone.The recycled coarse aggregate of C40 waste concrete is used to prepare C30 or C40 recycled concrete with weak interface aggregate the new slurry interface; and the preparation of the C 50 recycled concrete interface is the old slurry the new slurry interface .

Key words: recycled concrete;model of core sample;interface structure;micro-hardness;adhesive mortar