This study is performed to examine the physical and mechanical properties of concrete using recycled aggregate and industrial by-products. The test results show that the unit weight, compressive and flexural strength, ultrasonic pulse velocity and dynamic modulus of elasticity are decreased with increasing the content of recycled aggregate. But, the absorption ratio is increased with increasing the content of recycled aggregate. The unit weight is 2,237∼2,307 kg/㎥, the absorption ratio is 2.96∼4.12%, the compressive strength is 415∼532 kgf/㎠, the flexural strength is 75∼96 kgf/㎠, the ultrasonic pulse velocity is 4,350∼4,949 m/s and the dynamic modulus of elasticity is 390×10³~465×10³ kgf/㎠, respectively. These recycled aggregate concrete can be used for high strength concrete.