Introducing artificial flaws in Engineered cementitious composites (ECC) through nanocomposite coating of aggregates: A novel approach and mechanism

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

Cement & concrete composites Pub Date : 2024-12-12 DOI:10.1016/j.cemconcomp.2024.105893

Zhuo Tang , Cheng Li , Jing Zhong

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Abstract

This study introduces a novel method for incorporating artificial flaws in Engineered Cementitious Composite (ECC) by applying carbon nanotube (CNT) polymer nanocomposite coatings, which has a porous microstructure, to aggregates. In comparison with the control ECC, the implementation of coated aggregates can improve the crack number and the strain capacity of ECC by 268 % and 83.7 %, respectively, while only incurring a 14.1 % decrease in compressive strength. Furthermore, increasing the sand-to-binder (s/b) ratio from 0.36 to 0.75 can improve the strain capacity of ECC by 213.1 %, with a reduction of compressive strength by 22.6 %. The underlying mechanisms were investigated both experimentally and theoretically, which revealed that the reduced spacing between artificial flaws significantly increases the stress concentration factor, thereby facilitating crack initiation and propagation. The simplicity, cost-effectiveness, and general applicability of this coating technique offer a valuable method for enhancing the performance of ECC, which could substantially advance its practical applications.

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纳米复合包覆骨料在工程胶凝复合材料（ECC）中引入人工缺陷：一种新的方法和机理

本研究提出了一种将具有多孔结构的碳纳米管（CNT）聚合物纳米复合涂层涂覆在聚集体上，以弥补工程胶凝复合材料（ECC）中人工缺陷的新方法。与对照ECC相比，采用包覆骨料可使ECC的裂纹数和应变能力分别提高268%和83.7%，而抗压强度仅降低14.1%。砂胶比（s/b）由0.36提高到0.75，可使ECC的应变能力提高213.1%，抗压强度降低22.6%。实验和理论分析表明，人工缺陷间距的减小显著提高了应力集中系数，从而促进了裂纹的萌生和扩展。该涂层技术的简单性、经济性和通用性为提高ECC的性能提供了一种有价值的方法，可以大大推进ECC的实际应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.