Properties of artificial slags produced by the ZEWA process

摘要

Treatment of steel-making slags, EAF dusts, fly ash, car shredder residue, under reducing conditions by means an electric arc furnace (ZEro WAste process) produces iron alloy that can be recycled by the steel industry and a mineral having the same chemical composition (main oxides, CaO,Al2O3,SiO2, MgO) and the same mineralogical composition (% glass) as an industrial blast furnace (BF) slag. Utilization of these new materials as cementitious additives requires an evaluation of their properties. In this study, we compare the reactivity (reactivity index) and the durability (carbonation) of these materials to the equivalent BF slag. Comparisons are carried out with mixture 50/50 of slag, ground at 4500 cm2/g and Portland cement type 1. Results show that the main properties of these artificial slags are in the same range as those found with industrial BF slag and thus can be used as cementitious replacement.