粗骨料粒度对 ITZ 厚度和微观特性以及混凝土力学特性的影响

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Yuli Wang , Wanyu Zhang , Junjie Wang , Rong Huang , Guanghui Lou , Shuqiong Luo
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引用次数: 0

摘要

本研究探讨了粗骨料粒度对混凝土力学性能的影响。应用纳米压痕和扫描电子显微镜(SEM)技术表征了界面过渡区(ITZ)的微观特性和厚度。讨论了粗骨料粒度对混凝土抗压强度(σc)和弹性模量(E)的影响,以及界面过渡区的微观特性与混凝土宏观特性之间的关系。此外,还采用格里菲斯微裂缝理论解释了相关机理。讨论了 ITZ 的微观特性与混凝土宏观特性之间的关系。结果表明,在水胶比 w/c 较低(0.3)的混凝土中,ITZ 厚度随粗骨料粒径的增加而增加,混凝土性能也随之降低。而在水灰比较高(0.4)的混凝土中,存在一个最佳的粗骨料粒度,可使 ITZ 厚度最小,强度最高。将 ITZ 视为混凝土破坏的初始裂缝,根据格里菲斯的微裂缝理论,可以将混凝土性能与 ITZ 厚度联系起来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of coarse aggregate size on thickness and micro-properties of ITZ and the mechanical properties of concrete
This research delves into the impact of coarse aggregate particle size on the mechanical properties of concrete. Nano-indentation and scanning electron microscope (SEM) techniques were applied to characterize the micro-properties and thickness the Interfacial Transition Zone (ITZ). The effect of coarse aggregate size on concrete's compressive strength (σc) and elastic modulus (E) and the relationship between the micro properties of the ITZ and the macro properties of concrete were discussed. In addition, Griffith's microcrack theory was adopted to explain related mechanisms. The relationship between the microscopic properties of the ITZ and the macroscopic properties of concrete was discussed. The results show that, in concrete with a low water cement-ratio w/c (0.3), thickness of ITZ increased with the coarse aggregate size and concrete properties decreased. While, in concrete with a higher w/c (0.4), there exists an optimum coarse aggregate size for the lowest thickness of ITZ and highest strength. Taking the ITZ as the initial crack in concrete failure, concrete properties can be linked to ITZ thickness from Griffith's microcrack theory.
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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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