Abstract：In order to study the influence factors of compressive strength on recycled concrete,recycled aggregate in the range of 5 ~ 31.5 mm was obtained from waste samples of C30 in the laboratory through dealing and cube compressive strength test was conducted on recycled coarse aggregate concrete under different conditions.The results indicate that the compressive strength of the concrete decreases greatly with larger blending amount of recycled coarse aggregate in the same water-cement ratio and the age.Orthogonal design is adopted to arrange the test by fully taking into account water-cement ratio,the replacement of recycled coarse aggregate,the age,and the interaction between one factor and the other.The analysis of variance is established and analyzed the influence rate of the compressive strength.It also concludes that order factor affecting the compressive strength of recycled concrete is the age,the replacement of recycled coarse aggregate,and water-cement ratio.The order of the interaction function is as follows: the replacement rate and water-cement ratio,water-cement ratio and the age,the replacement rate and the age.

Keyword：recycled coarse aggregate concrete;compressive strength;orthogonal test;the analysis of variance;