Porous Bulk Specimens in C a O ‐ M g O ‐ S i O ₂ Systems Using Steel Slag and Altered Additives by Conventional Sintering

To obtain the porous, bulk, brick like samples the following mixtures were pressed and sintered at different temperatures: steel slag, sintering aids (soda lime glass, sodium phosphate), and common foaming additives (like dolomite, perlite). The bulk densities of final composites were from 1.3 to 2.41 g/cm ³ , and open porosities were from 15 to 40 vol%. The bending strengths of composites varied from 5.5 to 15.9 MPa. The final phase of sintered samples was forming of calcium magnesium silicate. The samples which had 80 wt% slag–5 wt% SiC–5 wt% perlite–5 wt% boric acid–5 wt% sodium phosphate showed the 40 vol% porosity and 6.7 ± 0.2 MPa bending strength.