Shack Yee Hiew , Keat Bin Teoh , Sudharshan N. Raman , Chung-Chan Hung , Doo-Yeol Yoo , Kuo-Wei Wen , Daniel Kong , Yen Lei Voo
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引用次数: 0
Abstract
Accurately characterising steel fibres is paramount for developing a representative confinement model for Ultra-High-Performance Concrete (UHPC). Existing models oversimplify the fibre contributions by assuming a singular orientation, which fails to reflect the material variation resulting from actual fibre distribution. In this study, the authors refined the fibre orientation characteristics to establish a correlation with the confined core capacity at the structural level. To achieve this, multi-scale investigations, from experimental testing to X-ray micro-computed tomography (micro-CT) imaging on steel-confined UHPC specimens, were conducted, by varying internal (fibre types and contents) and external confinement pressures. A novel framework was developed to calibrate effective fibre orientation under varying fibre contents. This led to the introduction, for the first time, of a reliable fibre orientation model for UHPC subjected to varying confinement levels. The proposed model provided accurate predictions of the confined core capacity, aligning well with both scanned and unscanned specimens.
要为超高性能混凝土(UHPC)开发具有代表性的约束模型,准确描述钢纤维的特性至关重要。现有模型假定纤维取向单一,从而过度简化了纤维的贡献,无法反映实际纤维分布造成的材料变化。在本研究中,作者对纤维取向特征进行了改进,以便在结构层面上建立与约束芯材承载力的相关性。为此,通过改变内部(纤维类型和含量)和外部约束压力,对钢约束超高性能混凝土试样进行了从实验测试到显微 X 射线计算机断层扫描(micro-CT)成像的多尺度研究。开发了一个新框架,用于校准不同纤维含量下的有效纤维取向。由此,首次推出了适用于不同约束水平的超高性能混凝土的可靠纤维取向模型。所提出的模型可准确预测约束芯材的承载能力,并与扫描和未扫描的试样完全吻合。
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.