关键词: 再生混凝土;配合比;力学性能;收缩性能

Abstract: Mechanical property and shrinkage performance of recycled concrete compared with the natural concrete, which were made by conventional aggregate replacement method and equivalent volume mortar method. The results show that the change rule of the compressive strength of recycled concrete cube is basically the same as the ordinary concrete. The strength of different age of recycled concrete prepared by the conventional aggregate replacement method is lower than that of the other kinds of concrete. In the later period, the cubic compressive strength of recycled concrete made with the equivalent volume mortar method is increased obviously;the shrinkage of recycled concrete is increased along with the age of concrete. The 280 d shrinkage rate of recycled concrete prepared by the conventional aggregate replacement method is increased by 4 . 7%, while the shrinkage rate of recycled concrete prepared by equivalent volume mortar method is 10. 2% lower than that of ordinary concrete in 280 d.

Key words: recycled aggregate concrete;mix proportion;mechanical property;shrinkage property