Slag is referred as granulated slag when subject to grinding according to the standard NF IN 151671 [15]. Granulated blast furnace slag (GBFS) has a morphological form of clearcolour sand. GBFS shares the same main chemical compounds (mainly SiO 2,CaO,Al 2O 3, MgO) [2,11, 16–20] as ordinary Portland cement [20–23]. GBFS has a direct utiliza