CO2 mineralization mechanism of chlorellestadite: Impact on strength development

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-09-10 DOI:10.1016/j.cemconcomp.2025.106330

Mohamed Abdelrahman , Vikram Kumar , Hyeonseok Jee, Nishant Garg

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引用次数: 0

Abstract

Chlorellestadite (Ca₁₀(SiO₄)₃(SO₄)₃Cl₂) is the primary phase formed after the thermal treatment of waste-to-energy (WTE) ashes and is also present in eco-cements produced from WTE ashes. CO₂ curing of such systems is known to facilitate strength development. However, the precise carbonation reaction mechanism of chlorellestadite is not well understood. Here, by conducting a systematic investigation on high-purity, synthetic chlorellestadite samples, we suggest a new reaction mechanism and propose Pathways for beneficial use. Specifically, the carbonation mechanism involves 3 parallel reactions (R1-R3) wherein, R1 involves carbonation of chlorellestadite, R2 involves carbonation of calcium chlorosilicate (Ca₃SiO₄Cl₂), and R3 involves carbonation of sinjarite (CaCl₂.2H₂O) – all together leading to 29.7 % of CO₂ uptake. Given this CO₂ uptake potential, we find that cement blended with 20 % chlorellestadite can be subject to simultaneous hydration and carbonation, forming binders with enhanced strength and a lower CO₂ footprint. These findings elucidate Pathways for utilizing a relatively inexpensive source of calcium.

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小球藻CO2矿化机制：对强度发育的影响

小球藻(Ca10（SiO4)3(SO4)3Cl2）是垃圾焚烧（WTE）灰烬热处理后形成的初级相，也存在于垃圾焚烧（WTE）灰烬生产的生态水泥中。已知这种体系的CO2固化可以促进强度的发展。然而，小球藻石碳酸化反应的确切机理尚不清楚。本文通过对高纯度合成小球藻样品的系统研究，提出了一种新的反应机理，并提出了有益利用的途径。具体来说，碳化机制涉及3个平行反应（R1-R3），其中R1涉及绿球藻石的碳化，R2涉及氯硅酸钙（Ca3SiO4Cl2）的碳化，R3涉及辛长石（CaCl2.2H2O）的碳化，所有这些共同导致29.7%的二氧化碳吸收。考虑到这种二氧化碳吸收潜力，我们发现掺入20%小球藻石的水泥可以同时水化和碳化，形成具有增强强度和更低二氧化碳足迹的粘结剂。这些发现阐明了利用相对便宜的钙来源的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.