Abstract: By classifying fine iron tailings with -0.074 mm of 74.5% to be -0.045 mm, the thermal activation is adopted to improve the reaction activity of -0.045mm iron tailings which are prepared to be the compound Cementitious Materials. This material is mixed with +0.045 mm tailings to make fine aggregate concrete. There are 70% of tailings in preparation and the compression strength of up to 99 MPa at 28 d.

Key words: Fine iron tailing, Classification, Thermal Activation, Fine aggregate concrete, Pressure resistance intensity