关键词: 再生混凝土; 界面过渡区; 定量分析; 体积比;

Abstract: In order to quantitatively analyze the interface transition zone of recycled concrete, the quantitative calculation formula of thickness and volume of the interface transition zone of recycled concrete was derived in this paper. The thickness and volume of the outer surface transition zone of recycled concrete with different particle size aggregate were analyzed when the content of recycled aggregate was 30%. The influence of thickness and volume of recycled concrete with different particle size aggregate on the volume ratio of interface transition zone to aggregate was also analyzed with the relevant data. The feasibility of using quantitative calculation formula to calculate the thickness and volume of the interface transition zone of recycled concrete was verified. The research results showed that the thickness of old mortar attached to recycled aggregate, the thickness and volume of transition zone and the volume of transition zone of regenerated interface all increased with the increase of aggregate particle size, and decreased with the increase of abandoned concrete strength. The volume ratio of interfacial transition zone to aggregate decreased with the increasing of aggregate size and waste concrete strength. With the increase of the recycled aggregate content, the volume ratio of interface transition zone to aggregate increased, and the adverse effect on recycled concrete increased. This volume ratio can also be used as one of the parameters for characterizing the macroscopic mechanical properties of recycled concrete.

Key words: recycled concrete; interface transition zone; quantitative analysis; volume ratio;