Understanding the uneven phase distribution and multi-step reaction mechanism of carbonated γ-C2S-based foam concrete

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-10-16 DOI:10.1016/j.cemconcomp.2024.105803
Ming Lei , Zhichao Liu , Fazhou Wang , Shuguang Hu
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Abstract

γ-C2S has been attracting much attention as the role of exclusive or primary binder to fabricate carbonated materials due to its high carbonation reactivity. However, the very limited hydration reactivity of γ-C2S makes it difficult in the production of casting-formed materials such as foam concrete, and this is exacerbated by the presence of bursting-prone foams in the mixture. Given the highly cementitious property of Portland cement (PC), 10 wt% of PC was added to γ-C2S-based foam concrete (CFC) as the supplemented binder to maintain its cellular structure while providing demoulding strength. The compressive strength of the CFC (600 kg/m3), carbonated for 2 h at ambient conditions, impressively peaks at 4.49 MPa, comparable to that of autoclaved aerated concrete with the same density grade, and is three times higher than the standard strength of foam concrete. This is partly attributed to the more uniform air-void size distribution formed by the enrichment of cement hydration products on the void-wall. Furthermore, the presence of cement hydration products positively promotes the dissolution of calcium ions from γ-C2S, forming a mixture of calcium and silicon products. This paper aims to understand the carbonation mechanisms of composite CFC, and also provide guidance for further realizing the reaction process associated with multiple carbonatable phases.
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了解碳化γ-C2S泡沫混凝土的不均匀相分布和多步反应机理
γ-C2S具有很高的碳化反应活性,因此作为制造碳化材料的专用或主要粘结剂一直备受关注。然而,γ-C2S 的水化反应活性非常有限,使其难以用于泡沫混凝土等浇注成型材料的生产,而混合物中易爆泡沫的存在又加剧了这一问题。鉴于硅酸盐水泥(PC)的高胶凝特性,在基于 γ-C2S 的泡沫混凝土(CFC)中添加了 10wt.% 的 PC 作为补充粘结剂,以保持其蜂窝结构,同时提供脱模强度。在环境条件下碳化 2 小时后,CFC(600 公斤/立方米)的抗压强度达到 4.49 兆帕,与相同密度等级的蒸压加气混凝土相当,是泡沫混凝土标准强度的三倍。这部分归因于空隙壁上富集的水泥水化产物形成了更均匀的空隙大小分布。此外,水泥水化产物的存在会积极促进γ-C2S 中钙离子的溶解,形成钙硅混合产物。本文旨在了解复合 CFC 的碳化机理,并为进一步实现与多种可碳化相相关的反应过程提供指导。
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来源期刊
Cement & concrete composites
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.
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