Classification and Milling Increase Fly Ash Pozzolanic Reactivity

Upcycling and reclaiming of low quality or stored coal combustion fly ashes could enable to tap into a voluminous resource supplementary cementitious materials (SCMs) for low-carbon blended cements. Low reactivity are usually either too crystalline coarse. Beneficiation treatments coarse comprise size classification milling processes extract produce fine fractions higher pozzolanic reactivity. This article compares the effect on siliceous ash (FA). The intrinsic chemical is assessed using R3 heat release test method. results showed significant increases 57 40% classified milled compared initial ash, respectively. In addition portlandite consumption were measured cements with 30 wt.% Portland cement replacement by ashes. Both combined calculate degree reaction over time in cement. demonstrate strong particle reaction. It shown that increasing inherent an effective way both accelerating compressive strength gain enhancing late age reaching equivalent as neat 28 days attaining activity index 137% 90 days.