带初始缺陷的受腐蚀超高性能纤维增强混凝土(UHPFRC)的动态力学响应研究

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Zhaoping Song , Shaohua Li , Lulu Cheng , Qingliang Yu
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引用次数: 0

摘要

本研究探讨了存在初始缺陷的受腐蚀超高性能纤维增强混凝土(UHPFRC)的动态力学响应,并考虑了在长期使用过程中由各种预先存在的裂缝诱发腐蚀恶化的可能性。为此,采用了综合加速腐蚀法和分体式霍普金森压力棒(SHPB)/高速摄像等技术。结果表明,增加冲击前损伤会使裂纹密度和最大宽度分别增加 32.4%-62.3% 和 1.11-1.8 倍。在力学性能方面,初始缺陷和腐蚀的耦合损伤会对动态力学响应产生不利影响。典型的纤维模型规范 2010 适用于预测带有初始缺陷的腐蚀超高压泡沫混凝土的 DIF 演变。当带有初始缺陷的腐蚀试样再次承受轴向荷载时,沿薄弱界面以一定角度产生了大量剪切裂纹,从而揭示了相关的破坏机制。这些结果揭示了含有各种初始缺陷的腐蚀超高压泡沫塑料复合材料的动态响应,其失效机理也为使用状态评估提供了一些参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of the dynamic mechanical response of corroded ultra-high performance fiber reinforced concrete (UHPFRC) with initial defects
This study addresses the dynamic mechanical response of the corroded ultra-high-performance fiber-reinforced concrete (UHPFRC) with initial defects, considering the possibility of corrosion deterioration induced by various pre-existing cracks during the long-term service life. For this purpose, an integrated accelerated corrosion method and Split Hopkinson Pressure Bar (SHPB)/high-speed camera etc. techniques are employed. Results show that increasing pre-impacting damage promotes the crack density and maximum width by 32.4%–62.3 % and 1.11–1.8 times, respectively. In terms of mechanical properties, coupling damages of initial defects and corrosion have adverse effects on the dynamic mechanical response. Typical fib Model Code 2010 applies to predict the DIF evolution of the corroded UHPFRC with initial defects. Numerous shear cracks are created at an angle along the weak interface as the corroded specimens with initial defects are again subjected to axial loading, revealing the associated failure mechanism. These results shed light on the dynamic response of corroded UHPFRC containing various initial defects and the failure mechanism gives some reference to service status evaluation.
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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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