Steel slag is produced as by-product during the oxidation of steel pellets in an electric arc furnace. This by-product can be broken down to smaller sizes to be used as aggregates in asphalt and concrete. In the current research, locally produced steel slag in Egypt was used as a replacement of the natural aggregate for producing high strength concrete. Four groups consisted of twenty-four normal, high and ultra-high strength concrete mixtures with replacement percentages 0%, 33.33%, 66.67% and 100% by weight of the coarse aggregate with two cement contents (450 kg/m 3 and 600 kg/m 3 ) and three silica fume percentages (0%, 10% and 20%) were investigated. In addition, other three groups consists of six concrete mixes of cement contents 350 kg/m 3 and 450 kg/m 3 were cast to study the possibility of using the fine electric arc furnace steel slag particles as a replacement of the used natural fine aggregate in the concrete mixtures . The effect of the studied key parameters which are the replacement ratio of the used electric arc furnace steel slag (EAFSS), the cement content and the silica fume percentage on the volume weight, compressive strength, flexural strength, indirect tensile strength, static of elasticity modulus and Permeability coefficient were studied. The results indicated that the highest concrete strength was obtained for the mixtures possessed a percentage of 66.67% steel slag aggregates as a replacement of the coarse aggregate. Moreover, the replacement of the natural fine aggregate by the fine steel slag as well as the EAFSS coarse aggregate produced a high strength pervious porous concrete.

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