Investigation on the Cl− and heavy metals stabilization of MSWI fly ash by incorporating Portland cement and carbonation

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2025-03-11 DOI:10.1016/j.cemconcomp.2025.106043
Dezhi Zhao , Hexiang Wang , Caihong Xue , Qingxin Zhao , Wenyue Qi , Yuyang Tian
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Abstract

To achieve CO2 and municipal solid waste incineration fly ash (MSWI-FA) utilization in construction and building materials production, in this study a novel carbon mixing method was proposed to prepare cement-MSWI-FA pastes with improved properties. The effect of carbon mixing and curing on the compressive strength, Cl as well as heavy metal solidification and pore structure was investigated. The reaction products were analyzed with XRD, SEM-EDS and TG to reveal the role of CO2 mixing on the phase assemblage development. The results showed that a ‘1.5 min normal mixing followed by 1.5 min carbon mixing’ procedure allowed the cement paste with 60 % MSWI-FA to obtain a compressive strength reaching 20 MPa at 28d. Compared with carbon curing, carbon mixing allowed easier and homogenous CO2 diffusion, and thus increased the CO32−/HCO3 in the pore solution for the formation of CaCO3 and Mc. The CaCO3 functioned as filler to refine the pore structure and thus contributed to the compressive strength improvement, while the Mc was converted to the Fs and AFt with the presence of Cl and SO42− at 28d, enhancing the Cl and heavy metals solidification. The proposed method and the test results of this study can provide technique support for the utilization of CO2 and MSWI-FA.
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来源期刊
Cement & concrete composites
Cement & concrete composites 工程技术-材料科学:复合
CiteScore
18.70
自引率
11.40%
发文量
459
审稿时长
65 days
期刊介绍: Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
期刊最新文献
Low-carbon UHPC with carbonated blast furnace slag: Impact of mineral composition, carbonation degree, and CaCO3 polymorphs Investigation on the Cl− and heavy metals stabilization of MSWI fly ash by incorporating Portland cement and carbonation Editorial Board Impact of hematite in red mud on hydration characteristics and environmental performance of cementitious materials Experimental characterization and constitutive modelling of the anisotropic dynamic compressive behavior of 3D printed engineered cementitious composites
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