Carbonation hardening of Portland cement with recycled supplementary cementitious materials

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-12-18 DOI:10.1016/j.cemconcomp.2024.105904

Maciej Zajac , Raoul Bremeier , Jan Deja , Magdalena Król , Mohsen Ben Haha

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引用次数: 0

Abstract

This study investigated composite cements with recycled concrete pastes (RCP) and the carbonated analogue, comparing them to Portland and limestone cements. The carbonation curing resulted in a carbonation degree of around 30 %. The presence of supplementary cementitious materials had little impact on the carbonation degree and phase assemblage. Cement pastes consisted of ettringite, calcium carbonate, C-S-H phase and silica gel. This phase assemblage transformed upon further hydration. The alumina-silica gel from cRCP did not contribute significantly to the reactions but modified porosity. The hydrates from RCP carbonated, however did not contributed to the strength evolution. Still, replacing limestone with RCP positively contributes to environmental sustainability by increasing CO₂ sequestration. Composite cements had lower strength, but those with carbonated RCP showed higher compressive strength and faster strength evolution. This effect was related to the appreciable porosity distribution compensating for the clinker dilution impact and a fast clinker hydration during the post carbonation curing.

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含回收胶凝补充材料的硅酸盐水泥的碳化硬化

这项研究调查了使用再生混凝土浆（RCP）和碳化类似物的复合水泥，并将其与波特兰水泥和石灰石水泥进行了比较。碳化固化后，碳化程度约为 30%。补充胶凝材料的存在对碳化程度和相组合的影响很小。水泥浆由乙长石、碳酸钙、C-S-H 相和硅胶组成。这种相组合在进一步水化后发生了变化。cRCP 中的氧化铝-硅凝胶对反应的影响不大，但可改变孔隙率。而 RCP 碳酸水合物则没有促进强度的演变。不过，用 RCP 替代石灰石可以增加二氧化碳的封存，从而对环境的可持续发展做出积极贡献。复合水泥的强度较低，但碳化 RCP 水泥的抗压强度更高，强度变化更快。这种效果与显著的孔隙分布补偿了熟料稀释的影响以及碳化后固化过程中熟料的快速水化有关。

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.