The experiment focused on the absorption and drainage characteristics of recycled coarse aggregate. The recycled coarse aggregate bonded with strain gauges was embedded in C30 strength grade concrete, and the shrinkage strain of recycled coarse aggregate in concrete during drying shrinkage was measured directly. Based on the relationship between the strain and drainage rate of recycled coarse aggregate under different humidity conditions, the drainage characteristics of recycled coarse aggregate in concrete were calculated, and the relationship between the drainage rate of recycled coarse aggregate and the drainage rate of recycled coarse aggregate was found out. The results show that the trend line of strain and saturation curve of regenerated coarse aggregate is relatively close to that of natural coarse aggregate in the process of draining and drainage, and the strain variation caused by dry and wet of the two kinds of aggregate has a reversible trend. The relationship between the drainage rate of recycled coarse aggregate and Natural aggregate and the Linear relationship between recycled coarse aggregate and Natural aggregate; The shrinkage strain of coarse aggregate in concrete is smaller than that of specimen, and the shrinkage strain of re-cycled coarse aggregate and recycled concrete is larger than that of natural aggregate and concrete; The drainage rate of recycled concrete is higher than that of internal recycled coarse aggregate.
