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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城市生活垃圾粉煤灰在碱活化材料中作为辅助前驱体的加速碳酸化

由于废料回收和高炉渣在水泥工业中的使用增加，用于碱活性材料（AAMs）的高炉渣（BFS）供应量下降。迫切需要可持续的补充前体，以确保aam的进展。采用加速碳化（AC）技术对城市生活垃圾焚烧飞灰（MFA）进行处理，使其转化为合适的前驱体。由于熟石灰的存在，MFA表现出较强的CO2捕获能力，在交流6 h后，方解石含量提高了67%，重金属浸出量显著降低，Cu和Pb浸出液分别下降了53.1%和73.5%。测试了含有0-50 wt%碳化MFA （CMFA）的AAM混合物。虽然CMFA减缓了早期结构并改变了新鲜混合物的性质，但10%的CMFA达到了与参考材料相当的28天强度，并且硬化砂浆的重金属渗滤液符合环境标准。结果证实CMFA是AAMs的一种可行的补充前体。

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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.