Elucidating factors on the strength of carbonated compacts: Insights from the carbonation of γ-C2S, β-C2S and C3S

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Sixue Zhao , Zhichao Liu , Fazhou Wang , Shuguang Hu
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Abstract

Accelerated carbonation presents a promising approach for enhancing the early strength of cement-based materials while simultaneously sequestering CO₂. This study examines the carbonation of γ-C₂S, β-C₂S, and C₃S compacts to identify the critical factors influencing strength development over extended curing periods. Analysis of the evolution of mechanical properties, microstructure, and phase assemblages reveals three key factors: 1) Degree of carbonation, which directly correlates with the density of the compacts; 2) Crystalline form and crystal size of calcium carbonate, influencing the strength of the crystal interface; and 3) Silica gels, which act as a phase boundary, with hydration products forming in the later stages of β-C₂S carbonation potentially affecting strength. The findings indicate that calcite promotes rapid strength gain in the early stages, while aragonite contributes to long-term performance. The presence of hydration products within the silica gel phase boundary may explain the observed strength reduction in β-C₂S compacts during extended carbonation. These insights provide valuable guidance for optimizing the design and application of carbonated cement-based materials for sustainable construction.
阐明碳化密实物强度的影响因素:从γ-C2S、β-C2S 和 C3S 的碳化过程中获得的启示
加速碳化是提高水泥基材料早期强度并同时封存二氧化碳的一种可行方法。本研究考察了 γ-C₂S、β-C₂S 和 C₃S 密实材料的碳化过程,以确定影响延长固化期强度发展的关键因素。对机械性能、微观结构和相组合演变的分析揭示了三个关键因素:1)碳化程度,它与密实物的密度直接相关;2)碳酸钙的结晶形式和晶体尺寸,它影响晶体界面的强度;3)硅凝胶,它作为相界,在 β-C₂S 碳化后期形成的水合产物可能会影响强度。研究结果表明,方解石在早期阶段能促进强度的快速提高,而文石则有助于提高长期性能。硅胶相界中水合产物的存在可能解释了在长时间碳化过程中观察到的β-C₂S压实强度降低的原因。这些见解为优化可持续建筑碳化水泥基材料的设计和应用提供了宝贵的指导。
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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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