Achieving instantaneous activation of recycled concrete powder by hyper-gravity carbonation

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

Cement & concrete composites Pub Date : 2025-06-10 DOI:10.1016/j.cemconcomp.2025.106177

Zhenjiang Gu, Long Jiang, Zihan Ma, Yi Jiang, Peiliang Shen, Chi Sun Poon

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Abstract

In this study, a hyper-gravity environment was used for carbonation, aiming at achieving rapid carbonation for activating recycled concrete powder (RCP). The degree of carbonation, mineralogical changes, and microstructural evolution of the RCP during hyper-gravity carbonation (HGC) were monitored and compared with normal carbonation (NC). The results showed that HGC exhibited a carbonation rate 30 times higher than that of NC in 10 min, including the precipitation of 71.1 % calcium carbonate (Cc) and 95.08 % fully polymerized Q⁴ silicate. In HGC, RCP developed a unique structure characterized by a Cc shell and a silica core. HGC could overcome the gas/solid-liquid limiting steps in NC with its ultra-high mass transfer rates and shear forces, allowing for simultaneous and efficient dissolution and carbonation. The proposed HGC method provides a significant advancement in the joint fields of industrial CO₂ capture and waste concrete recycling.

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利用超重力碳化实现再生混凝土粉的瞬时活化

本研究采用超重力环境进行碳化，旨在实现再生混凝土粉（RCP）的快速碳化活化。监测了超重力碳酸化（HGC）过程中RCP的碳酸化程度、矿物学变化和微观结构演化，并与正常碳酸化（NC）进行了对比。结果表明，HGC在10 min内的碳化率是NC的30倍，其中碳酸钙（Cc）的沉淀率为71.1%，Q4硅酸盐的完全聚合率为95.08%。在HGC中，RCP形成了一种独特的结构，其特征是Cc壳和二氧化硅核。HGC凭借其超高的传质速率和剪切力，可以克服NC中的气固液限制步骤，从而实现同时有效的溶解和碳化。提出的HGC方法在工业CO2捕集和废混凝土回收利用的联合领域取得了重大进展。

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.