Stabilization of metastable calcium carbonate polymorphs on the surface of recycled cement paste particles: A two-step carbonation approach without chemical additives

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Qingsong Zhou , Amr Meawad , Wei Wang , Takafumi Noguchi
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Abstract

In this study, a two-step carbonation method is developed to control the formation of calcium carbonate (Cc) polymorphs on the surface of recycled hardened cement paste (RHCP) without the use of chemical additives. In the first step, RHCP undergoes semi-dry carbonation under controlled humidity conditions, followed by wet carbonation at various temperatures in the second step. The results show that vaterite and aragonite are stabilized during the wet carbonation process, forming primarily on the surface of RHCP particles. The stabilization of the metastable Cc phases is driven by the synergistic effect of existing Cc seeds in the RHCP and the reaction temperature. A temperature range of 9–48 °C promotes the formation of vaterite, while higher temperatures (60–90 °C) lead to its dissolution. The calcite seeds present in RHCP do not enhance the formation of vaterite and aragonite during wet carbonation. This method offers a potential practical approach for valorizing concrete waste while capturing CO₂ from the atmosphere.
再生水泥浆颗粒表面可迁移碳酸钙多晶体的稳定化:不使用化学添加剂的两步碳化法
本研究开发了一种两步碳化法,可在不使用化学添加剂的情况下控制再生硬化水泥浆(RHCP)表面碳酸钙(Cc)多晶体的形成。第一步,RHCP 在可控湿度条件下进行半干碳化,第二步在不同温度下进行湿碳化。结果表明,在湿碳化过程中,脉石和文石得到稳定,主要在 RHCP 颗粒表面形成。在 RHCP 中现有 Cc 种子和反应温度的协同作用下,可稳定的 Cc 相得以稳定。9-48°C 的温度范围可促进钒铁矿的形成,而较高的温度(60-90°C)则会导致其溶解。在湿碳化过程中,RHCP 中存在的方解石种子不会促进钒钾矿和文石的形成。这种方法为混凝土废料的价值化提供了一种潜在的实用方法,同时还能从大气中捕获二氧化碳。
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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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