Accelerated carbonation of MSWI fly ash as a supplementary precursor in alkali-activated materials

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2025-04-01 DOI:10.1016/j.dibe.2025.100651

Yubo Sun , Yaxin Tao , Zhenming Li , Wenjun Lu , Zhiyuan Liu , Shengtian Zhai , Jian Zhang

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引用次数: 0

Abstract

The supply of blast furnace slag (BFS) for alkali-activated materials (AAMs) has declined due to increased scrap recycling and BFS usage in cement industry. Sustainable supplementary precursors are urgently needed to ensure the progress of AAMs. This study treated municipal solid waste incineration (MSWI) fly ash (MFA) with accelerated carbonation (AC) to convert the waste material into suitable precursors. MFA exhibited strong CO₂ capture due to the presence of slaked lime, with calcite content rising by 67 % after 6-h of AC. Heavy metal leaching was significantly reduced, with Cu and Pb leachate decreasing by 53.1 % and 73.5 %, respectively. AAM mixtures with 0–50 wt% carbonated MFA (CMFA) were tested. While CMFA slowed early structuration and altered fresh mixture properties, 10 wt% CMFA achieved comparable 28-day strength to the reference, and heavy metal leachate from hardened mortars met environmental standards. Results have confirmed CMFA is a viable supplementary precursor for AAMs.

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.