Wet carbonation of MSWI fly ash for sustainable limestone calcined clay cement-type composites

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-11-22 DOI:10.1016/j.cemconcomp.2024.105866

Miao Lu , Yan Xia , Jianhua Yan, Lei Wang

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Abstract

The high alkalinity, chlorine, and potentially toxic elements (PTEs) content of municipal solid waste incineration fly ash (MSWI FA) hindered its potential application in construction materials. This study proposed the recovery of MSWI FA via wet carbonation and developed a novel sustainable carbonated-MSWI FA-based binder. Experimental results showed that MSWI FA achieved 12 wt% CO₂ capture through wet carbonation. Besides, wet carbonation removed 82 % of chlorine from MSWI FA and reduced the leaching risk of PTEs in both pretreatment leachate and carbonated-MSWI FA. The designed sustainable paste exhibited an outstanding 28-day compressive strength of 45.6 MPa. The chloride and sulfate salts in the carbonated-MSWI FA played an important role in hydration kinetics of pastes. Sulfate in carbonated-MSWI FA reacted with aluminate to form ettringite, and the residual chloride was captured by CO₃-Cl-AFm. The proposed wet carbonation route provided a promising and sustainable way for CO₂ capture and facilitating the application of MSWI FA in construction materials.

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湿法碳化 MSWI 粉煤灰以实现可持续的石灰石煅烧粘土水泥型复合材料

城市固体废物焚烧飞灰（MSWI FA）的碱度、氯和潜在有毒元素（PTEs）含量较高，阻碍了其在建筑材料中的潜在应用。本研究提出了通过湿法碳化回收 MSWI FA 的方法，并开发了一种新型的可持续碳化-MSWI FA 粘合剂。实验结果表明，通过湿法碳化，MSWI FA 实现了 12 wt% 的二氧化碳捕集。此外，湿法碳化还能去除 MSWI FA 中 82% 的氯，并降低预处理渗滤液和碳化-MSWI FA 中 PTEs 的浸出风险。所设计的可持续浆料 28 天抗压强度高达 45.6 兆帕。碳化-MSWI FA 中的氯盐和硫酸盐对浆料的水化动力学起着重要作用。碳化-MSWI FA 中的硫酸盐与铝酸盐反应生成乙丁睛石，残余氯化物被 CO3-Cl-AFm 捕获。所提出的湿法碳化路线为二氧化碳捕集提供了一种有前景且可持续的方法，并促进了 MSWI FA 在建筑材料中的应用。

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来源期刊

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.