In this study, firstly the effects of concrete crushing procedure on properties of recycled aggregate were examined.
　The main results obtained in this study are as follows:
1) The properties of recycled coarse aggregate are affected by the attached old mortar to the aggregate surface. It is recommended that the old mortar on the aggregate surface should be removed as much as possible.
2) The recycled concrete tested in this study showed good flowability.
3) The compressive strength of the recycled concrete was slightly smaller than that of the concrete using normal aggregate. However, even the compressive strength of the recycled concrete can be controlled with the water to cement ratio to a certain strength.