The purpose of this study is to estimate the characteristics of the concrete using the aggregate by mixing, for the effective utilization of low quality aggregate. In this study, concretes using various low quality aggregates by mixing with high-quality aggregates, such as slag aggregate were tested. The type of aggregate and mixing rate were different each other. The specimens of such mixed aggregate concretes were produced, and fresh properties, strength characteristic, drying shrinkage and resistance of freezing and thawing were measured. In addition, the basic examination was carried out on the estimation method of characteristics of the mixed aggregate concrete from the quality of the aggregates.