This feasibility study demonstrates improved reactivity of MSWI fly ash over uncarbonated ashes, suggesting new SCMs for concrete.
This study explores using carbonated coal fly ash (CCFA) and municipal solid waste incineration (MSWI) fly ash (CMFA) as supplementary cementitious materials. Carbonation treatment typically increase surface area and enable remarkable CO₂ uptake, with CMFA showing improved reactivity compared to uncarbonated ashes. Compressive strength tests revealed that CMFA outperformed uncarbonated MFA, while CCFA-incorporated mortar showed lower strength than uncarbonated counterpart. All blends consisting of Portland-limestone cement and carbonated ashes appear to meet the requirements of ASTM C1157. It suggests carbonated coal and MSWI fly ashes are viable alternative SCMs for sustainable concrete production.
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Javed et al. (2025) studied this question.
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