Mechanical Properties of Non-cement Mortars Fabricated under Supercritical Carbonation Conditions without Alkali Activators and Composed of Fly ash and Fused Waste Slag

Abstract

The mechanical properties of non-cement mortars that were fabricated without alkali activators and composed of fly ash (FA) mixed with fused waste slag (FWS) were investigated. Although the specimens were only made with the addition of distilled water, the high pH (pH > 13) of the slurry, which was caused by the hydration of the FA, caused the geopolymerization reactions of the FWS to occur and create the non-cement mortar. Non-cement mortars mixed with FWS and fabricated without alkali activators can achieve compressive strengths of over 20MPa. The compressive strength of the specimens decreased with increasing FWS content.