Sustainable and mechanical properties of Engineered Cementitious Composites with biochar: Integrating micro- and macro-mechanical insight

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-10-24 DOI:10.1016/j.cemconcomp.2024.105813
Tianyu Wang , Yihong Tang , Shaofeng Qin , Gang Li , Haoliang Wu , Christopher K.Y. Leung
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Abstract

Engineered Cementitious Composites (ECC) are ductile, strain-hardening cementitious composites with a tightly controlled crack opening profile. A significant concern in the development and application of ECC is its high carbon emissions associated with high cement content consumption. As an emerging green additive, biochar can significantly cut down on the carbon emission of concrete products. However, research that integrates micro- and macro-mechanical insights with biochar incorporation is limited. In this study, micro-mechanical tools indicated that a certain amount of substitution biochar could enhance the tensile properties of ECC. The study assessed various properties including compressive strength, porosity, density, tensile performance, crack pattern, sustainability and cost of ECC with different biochar proportions. The findings showed that incorporating 10 %–20 % biochar effectively increased the tensile strain capacity and decreased the crack opening width in ECC materials. This improvement can be attributed to the introduction of finer biochar particles (≤75 μm) at the fiber/matrix interfacial transition zone, which alters the fiber-bridging force by reducing the chemical and frictional bond strength between the fiber and matrix, as revealed by micro-mechanical tests and microstructural inspection. Moreover, the utilization of biochar contributes to reducing the carbon emission of ECC, enhancing sustainability while maintaining a ∼10 % minimal reduction in compressive strength. Overall, this study introduces a novel approach for reusing low-carbon biomass waste in the production of building materials, offering potential advantages in micro- and macro-mechanical performance, cost-effectiveness, and environmental sustainability.
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含生物炭的工程水泥基复合材料的可持续性和力学性能:综合微观和宏观力学观点
工程水泥基复合材料(ECC)是一种韧性好、应变硬化的水泥基复合材料,具有严格控制的裂缝张开曲线。在开发和应用 ECC 的过程中,一个重要的问题是其与高水泥含量消耗相关的高碳排放量。作为一种新兴的绿色添加剂,生物炭可以大大减少混凝土产品的碳排放量。然而,将微观和宏观力学观点与生物炭掺合结合起来的研究还很有限。在这项研究中,微观力学工具表明,一定量的替代生物炭可以提高 ECC 的拉伸性能。研究评估了不同生物炭比例的 ECC 的各种性能,包括抗压强度、孔隙率、密度、拉伸性能、裂纹模式、可持续性和成本。研究结果表明,加入 10% 到 20% 的生物炭可有效提高 ECC 材料的拉伸应变能力,并减少裂缝开口宽度。这种改善可归因于在纤维/基体界面过渡区引入了更细的生物炭颗粒(≤75μm),从而通过降低纤维与基体之间的化学和摩擦结合强度来改变纤维桥接力。此外,生物炭的使用有助于减少 ECC 的碳排放,在保持抗压强度降低 10% 左右的同时提高可持续性。总之,本研究介绍了一种在建筑材料生产中再利用低碳生物质废物的新方法,在微观和宏观机械性能、成本效益和环境可持续性方面具有潜在优势。
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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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