Triaxial compressive behavior of 3D printed PE fiber-reinforced ultra-high performance concrete

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-10-30 DOI:10.1016/j.cemconcomp.2024.105816
Jun-Jie Zeng , Xianwen Hu , Hou-Qi Sun , Yue Liu , Wei-Jian Chen , Yan Zhuge
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Abstract

The layered deposition process of 3D concrete printing can lead to reduced mechanical properties at the interfaces between filaments. To address this limitation, external confinement devices, such as fiber-reinforced polymer (FRP) wrapping, have been proposed to enhance the strength of 3D-printed concrete concrete. Achieving this requires a solid understanding of the triaxial mechanical performance of 3D-printed concrete. This study presents an experimental investigation of the triaxial compressive behavior of 3D-printed PE fiber-reinforced ultra-high performance concrete (3DP-PEUHPC). A total of 16 pairs of concrete cubes were prepared, including mold-cast and 3D-printed specimens, and subjected to uniaxial and triaxial compression tests. The results revealed that the 3D-printed specimens exhibited either column-type or diagonal shear failures under triaxial compression. Weak bonding was observed at both filament-fusion and layer-fusion interfaces, with these weaker bonding interfaces, particularly when aligned parallel to the axial load, showing susceptibility to stress concentration and crack initiation. This led to a reduction in load-bearing capacity of the 3D-printed specimens compared to the mold-cast specimens. Importantly, as confining stresses increase, the difference in compressive strength between 3D-printed and mold-cast specimens decreases, highlighting the effectiveness of confinement in mitigating the directional weaknesses inherent in 3D-printed concrete. This paper also presents a modified model for predicting the axial stress-strain relationship of 3DP-PEUHPC under confinement, providing insights into the mechanism of FRP confinement on the compressive strength of 3D-printed concrete structures.
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3D 打印聚乙烯纤维增强超高性能混凝土的三轴抗压行为
三维混凝土打印的分层沉积过程会导致长丝界面的机械性能降低。为解决这一局限性,有人提出了外部约束装置,如纤维增强聚合物(FRP)包裹,以增强三维打印混凝土的强度。要实现这一目标,需要对三维打印混凝土的三轴力学性能有扎实的了解。本研究对三维打印聚乙烯纤维增强超高性能混凝土(3DP-PEUHPC)的三轴抗压行为进行了实验研究。共制备了 16 对混凝土立方体,包括模铸试件和 3D 打印试件,并对其进行了单轴和三轴压缩试验。结果表明,三维打印试样在三轴压缩下表现出柱状或对角线剪切破坏。在丝融合和层融合界面上都观察到了较弱的粘合,这些较弱的粘合界面,尤其是与轴向载荷平行排列时,容易出现应力集中和裂纹萌生。这导致 3D 打印试样的承载能力低于模铸试样。重要的是,随着约束应力的增加,三维打印试样与模铸试样之间的抗压强度差异也在减小,这凸显了约束在减轻三维打印混凝土固有的方向性弱点方面的有效性。本文还提出了一个修正模型,用于预测约束下 3DP-PEUHPC 的轴向应力-应变关系,为了解 FRP 约束对 3D 打印混凝土结构抗压强度的影响机制提供了见解。
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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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