Abstract: The compressive strength,carbonation resistance and freezing resistance of recycled concrete were studied based on the basic mechanical method and the durability methods.And the pore structure of recycled concrete was analyzed by mercury intrusion porosimetry (MIP).The results show that the compressive strength of recycled concrete is slightly lower than that of ordinary concrete.The porosity of the recycled concrete is 49.5% higher than that of ordinary concrete.The carbonation resistance of recycled concrete is less than that of ordinary concrete.The freezing resistance of recycled concrete is much less than that of ordinary concrete, and its mass loss rate is 3 times of that of ordinary concrete after 180 cycles.

Key words: recycled concrete;compressive strength;carbonation resistance;freezing resistance;pore size distribution