Recycled concrete powder-derived calcium carbonate ceramics by in-situ polymorph transformation-enhanced cold sintering

IF 14.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-09 DOI:10.1016/j.cemconcomp.2026.106463

Tiejun Ding , Jian Hou , Xuan Zhang , Abdulkareem Alsofi , Zihan Ma , Kai Cui , Long Jiang , Yi Jiang , Peiliang Shen , Christopher Cheeseman , Hong Wong , Chi Sun Poon

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Abstract

This study presents the preparation of calcium carbonate (CaCO₃) ceramics using vaterite derived from recycled concrete powder (RCP) through a novel in-situ polymorph transformation-enhanced cold sintering process. The resulting chemically bonded CaCO₃ ceramics consists of 100 % calcite and achieve high compressive strength and a relative density of up to 80.5 %. The initial transformation from vaterite to calcite occurs at particle surfaces, decreasing porosity between particles and gradually forming a core-shell structure with a dense outer shell and a porous interior. The fusion of these shells at the contact points of adjacent particles enhances the interparticle chemical bonding. Later polymorph transformations increase pore size and volume and promote particle fusion to form a more homogeneous microstructure. This increases strength by up to 40 % compared to CaCO₃ ceramics produced by conventional cold sintering. The research highlights the potential of utilizing waste concrete for sustainable and high-value CaCO₃ ceramic production.

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原位多晶转变强化冷烧结再生混凝土粉基碳酸钙陶瓷

本研究介绍了利用再生混凝土粉（RCP）衍生的水晶石，通过一种新的原位多晶转变增强冷烧结工艺制备碳酸钙（CaCO3）陶瓷。由此产生的化学结合CaCO3陶瓷由100%方解石组成，具有高抗压强度和高达80.5%的相对密度。由水晶石向方解石的初始转变发生在颗粒表面，颗粒间孔隙度降低，逐渐形成外壳致密、内部多孔的核壳结构。这些壳层在相邻粒子接触点的融合增强了粒子间的化学键合。后期的多晶转变增加了孔隙大小和体积，促进了颗粒融合，形成更均匀的微观结构。与传统冷烧结生产的CaCO3陶瓷相比，这增加了高达40%的强度。该研究强调了利用废弃混凝土生产可持续和高价值CaCO3陶瓷的潜力。

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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.