Forming zeolites and calcium silicate hydrates in Fe-rich, slag-based, porous inorganic polymers

This study provides insights on the formation of crystalline phases from Fe-rich slag-based porous inorganic polymers (porous IPs), cured under hydrothermal conditions. The IPs were synthesised using synthetic slags with different chemistries (from FeO-SiO 2 -CaO to -Al O 3 systems) as solid precursors, and a sodium silicate-based alkaline activator. Chemical expansion was used create structure. After hardening, monoliths hydrothermally processed at temperatures respective steam pressures (150 °C, 4.8 bar; 200 15.5 bar 250 39.7 bar) for durations (12–18 h). presence aluminium promoted zeolite analcime within first 12 h. calcium-silicate hydrates after longer curing duration; however, just had taken place. Next these phases, smectite nontronite calcium carbonates detected. • Porous activated materials slags. Formation C-S-H during Influence slag chemistry reaction products Fe 3+ found partially replace Al +3 in