Integrated non-destructive assessment of 3D printed UHPC microstructure using X-ray computed tomography and ultrasonic waves

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-09-19 DOI:10.1617/s11527-025-02776-w

Meiyan Bai, Jianzhuang Xiao, Tao Ding, Weihua Chen

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引用次数: 0

Abstract

3D printed ultra-high performance concrete (3DP-UHPC) has gained significant attention for its unique fiber distribution and superior mechanical performance characteristics. This study employed X-ray computed tomography (X-CT) imaging and ultrasonic techniques to quantitatively analyze the internal pore structure and fiber distribution of 3DP-UHPC. The findings revealed that the compressive strength of 3DP-UHPC exhibited anisotropy, following the order Z > X > Y. The pore volume distribution showed substantial variability, with the projected pore lengths along the X, Y and Z axes following the trend X > Y > Z. This uneven distribution contributed to reduced mechanical performance. Steel fibers exhibited a distinct 'cross-like' alignment within the 3D printed plane. Additionally, variations in amplitude, compressive strength, and average wave velocity showed consistent trends, all of which were positively correlated with wave velocity. These insights provide a theoretical foundation for improving non-destructive evaluation techniques and optimizing the performance of 3DP-UHPC.

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利用x射线计算机断层扫描和超声波对3D打印UHPC微观结构进行综合无损评估

3D打印超高性能混凝土（3D - uhpc）以其独特的纤维分布和优越的力学性能特点而备受关注。本研究采用x射线计算机断层扫描（X-CT）成像和超声技术定量分析了3d - uhpc的内部孔隙结构和纤维分布。结果表明：3d - uhpc的抗压强度表现为Z >； X >； Y的各向异性；孔隙体积分布表现出较大的变异性，预测孔隙长度沿X、Y和Z轴的变化趋势为X >； Y >； Z。这种不均匀的分布导致机械性能下降。钢纤维在3D打印平面内呈现出明显的“十字形”排列。振幅、抗压强度和平均波速的变化趋势一致，均与波速呈正相关。这些见解为改进无损评价技术和优化3d - uhpc性能提供了理论基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.