A novel internal carbonation method for utilisation of steel slag-based binder: strength, microstructure, and in-situ carbon migration

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

Cement & concrete composites Pub Date : 2025-07-30 DOI:10.1016/j.cemconcomp.2025.106267

Weiwei Chen , Peiliang Shen , Qinglong Qin , Yong Tao , Faqian Liu , Chi Sun Poon

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引用次数: 0

Abstract

A novel internal carbonation method is proposed in this study for synthesising high-strength steel slag-based binder, using carbonated recycled concrete fines (CRCF) as calcium carbonate carriers and sodium meta-aluminate (SMA) solution as a chemical activator. The results demonstrate that the internal carbonation accelerates hydration and densifies microstructure of steel slag paste. The SMA-CRCF-activated steel slag (SSCRA) paste can achieve a setting time of around 1 h and a 28-day compressive strength of up to 32 MPa, showing a reduction of 84 % in setting time and a 5.4-fold increase in compressive strength compared to the SMA-activated steel slag (SSA) paste. During the process, the CRCF is rapidly dissolved upon activation of SMA solution, releasing carbonate ions to react with katoite and portlandite first and then the larnite in steel slag. After the internal carbonation, the main carbonated phases are Mc and calcite. The resulting C-A-S-H gel generated in the SSCRA paste is less polymerised than that in the SSA paste due to the incorporation of released Ca²⁺ ions from CRCF. Compared to accelerated carbonation curing, this method enables an easier fabrication process for steel slag products and eliminates constraints related to product dimensions, offering greater flexibility for field applications.

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利用钢渣基粘结剂的一种新型内部碳化方法：强度、微观结构和原位碳迁移

本研究提出了一种以碳化再生混凝土细粒（CRCF）为碳酸钙载体，中间铝酸钠（SMA）溶液为化学活化剂的新型内碳化方法，用于合成高强度钢渣基粘结剂。结果表明：内部碳化加速了钢渣膏体的水化，使其微观结构致密化；sma - crcf活化钢渣（SSCRA）膏体凝结时间约为1小时，28天抗压强度高达32 MPa，与sma活化钢渣（SSA）膏体相比，凝结时间缩短84%，抗压强度提高5.4倍。在此过程中，CRCF在SMA溶液的活化下迅速溶解，释放出碳酸盐离子，先与钢渣中的钙钛矿和波特兰矿发生反应，然后再与铁镍矿发生反应。内部碳酸化后，主要碳酸化相为Mc和方解石。由于从CRCF中释放的Ca2+离子的掺入，在SSCRA膏体中产生的C-A-S-H凝胶比在SSA膏体中产生的聚合更少。与加速碳化固化相比，这种方法使钢渣产品的制造过程更容易，消除了产品尺寸的限制，为现场应用提供了更大的灵活性。

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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.