Modeling fiber alignment in 3D printed ultra-high-performance concrete based on stereology theory

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Enlai Dong , Zijian Jia , Lutao Jia , Suduan Rao , Xudong Zhao , Rui Yu , Zedi Zhang , Yueyi Gao , Wei Wang , Yamei Zhang , Yu Chen , Nemkumar Banthia
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引用次数: 0

Abstract

This paper introduces a theoretical model for forecasting fiber orientation in 3D-printed ultra-high-performance concrete (3DP-UHPC). Initially, the dynamic evolution process of fiber alignment in 3DP-UHPC was characterized using X-ray computed tomography (X-CT) and image analysis. The results indicated that fiber alignment during extrusion process was primarily constrained by the rigid boundary of nozzle. Leveraging stereology theory, the regularity of fiber alignment affected by boundary effects was elucidated. Following layer deposition, the flattening effect resulting from the nozzle's extrusion force and gravity of upper layers influenced fiber alignment along printing direction. To quantify this impact, a flattening correction coefficient was introduced to modify fiber orientation coefficient in an ideal state. Finally, considering the overlapping effect of boundary and flattening on fiber orientation in 3DP-UHPC, a theoretical model was developed to predict fiber orientation. The model demonstrated robust adaptability, providing valuable insights into the design of 3DP-UHPC with improved fiber reinforcement efficiency.
基于立体学理论的 3D 打印超高性能混凝土纤维排列建模
本文介绍了预测三维打印超高性能混凝土(3DP-UHPC)中纤维取向的理论模型。首先,利用 X 射线计算机断层扫描(X-CT)和图像分析表征了 3DP-UHPC 中纤维排列的动态演变过程。结果表明,挤压过程中的纤维排列主要受到喷嘴刚性边界的限制。利用立体学理论,阐明了纤维排列受边界效应影响的规律性。层沉积后,喷嘴挤出力和上层重力产生的扁平效应影响了纤维沿印刷方向的排列。为了量化这种影响,引入了扁平化修正系数来修正理想状态下的纤维取向系数。最后,考虑到边界和扁平化对 3DP-UHPC 中纤维取向的重叠影响,建立了一个理论模型来预测纤维取向。该模型具有强大的适应性,为设计具有更高纤维增强效率的 3DP-UHPC 提供了宝贵的见解。
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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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