Alkali-Activated Materials with Pre-Treated Municipal Solid Waste Incinerator Bottom Ash

This study presents the results of an experimental campaign on use municipal solid waste incinerator bottom ash (MIBA) and fly (FA) as precursors for production alkali-activated materials. MIBA was subjected to a pre-treatment stage in response two issues: high metallic aluminum content, which reacts pH solution, releasing hydrogen; low amorphous content silica-, aluminum- calcium-bearing phases, translates into limited formation reaction products. The proposed oxidizes most fraction compensates reactivity material via additional reactants. Different combinations FA were tried—mass-based ratios 0/100, 25/75, 50/50, 75/25, 100/0 MIBA/FA. Two mix designs alkaline activator with sodium hydroxide silicate evaluated by varying Na2O/binder SiO2/Na2O ratios. These mortars tested fresh hardened state. showed that effective at stabilizing dimensional variation MIBA. Despite lower MIBA, 50/50 MIBA/FA presented maximum 28-day compressive strength 25.2 MPa, higher than 5.7 MPa made only.