Repetitive water replenishment in CO2 curing: Enhancement in carbon uptake, reactivity, crystal development, and mechanical properties of low calcium binder composites

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

Cement & concrete composites Pub Date : 2025-03-17 DOI:10.1016/j.cemconcomp.2025.106053

Seongmin Cho, Heongwon Suh, Jaeyeon Park, Seonghoon Jeong, Jin Park, Sungchul Bae

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引用次数: 0

Abstract

Water plays a crucial role in the carbonation and phase evolution of low-calcium binders (LCBs) under a CO₂ curing environment. This study aimed to improve the mechanical properties of LCB composites through repetitive water replenishment during curing and investigate their impact on microstructural phase evolution and strength development. To assess the effect of the amount of water replenished, distilled water containing 5, 10, and 15 wt% of cement paste was introduced into the samples at 1, 3, 6, and 12 h during CO₂ curing. Water replenishment significantly improved the reaction degree of the LCB, resulting in a characteristic microstructure due to the distinctive CaCO₃ growth. Notably, the samples with water replenishment exhibited a substantial increase in compressive strength, up to two times higher than those without water supplementation, after 24 h of curing. Therefore, the addition of water to LCB composites during CO₂ curing enhances the chemical reactions and refines the microstructure.

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二氧化碳固化过程中的重复补水：提高低钙粘结剂复合材料的碳吸收、反应性、晶体发育和机械性能

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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.