Bending strength of investigated samples ranged between 4 and 18 MPa, whereas compressive strength varied between 30 and 60 MPa. Different mixtures of selected precursors were prepared in the Slag A/Slag R ratios 1/0, 3/1, 1/1, 1/3 and 0/1 and further activated with potassium silicate using an activator to slag ratio of 1:2 in order to select the optimal composition with respect to their mechanical properties. In the present study the locally available electric arc furnace steel slag (Slag A) and the ladle furnace basic slag (Slag R) from different metallurgical industries in Slovenia were selected for alkali activation because of promising amorphous Al/Si rich content. The alkali-activated (AA) slag-based materials are promising alternative products for civil engineering sector and industrial purposes. Namely, slags containing aluminate and silicate form a useful solid material when activated by an alkaline solution. Alkali activation is studied as a potential technology to produce a group of high performance building materials from industrial residues such as metallurgical slag.
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