Saddle stitching-enabled interfacial toughening in 3D printed concrete

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-09-17 DOI:10.1016/j.cemconcomp.2025.106336

Rijiao Yang , Chengji Xu , Xiufei You , Xinze Li , Hao Xue , Yu Peng , Qiang Zeng , Zhendi Wang

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引用次数: 0

Abstract

Reinforcement implantation in concrete 3D printing is always a challenging task. Herein, a saddle stitching reinforcement (SSR) was developed to reinforce 3D printed concrete (3DPC). Compression and splitting tests were conducted to evaluate the mechanical properties of SSR-3DPC with anisotropy assessment; digital image correlation (DIC) analysis was integrated to track the failure process and mode; and X-ray computed tomography (XCT) was employed to characterize the interfacial microstructure of stitched 3DPC specimens.Results demonstrate that the proposed saddle stitching technique effectively mitigates the splitting strength anisotropy, and enhances the slipping strength, ductility, and absorption energy through the combined action of stitch legs and crotch reinforcement. However, a weaker stitch-matrix interface forms due to the inadequate self-recovery of 3DPC slurries after implantation. These findings deepen the understanding of reinforcement implantation in viscous concrete slurries, and provide valuable insights for optimizing reinforcement strategies in concrete 3D printing.

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在3D打印混凝土中，鞍座缝合使界面增韧

混凝土3D打印中的钢筋植入一直是一个具有挑战性的课题。在此，开发了一种马鞍拼接加固（SSR）来加固3D打印混凝土（3DPC）。采用各向异性评价法对SSR-3DPC的力学性能进行了压缩和劈裂试验；结合数字图像相关（DIC）分析，跟踪故障过程和模式；采用x射线计算机断层扫描（XCT）对缝合后3DPC试样的界面微观结构进行表征，并定量分析缺陷。结果表明，鞍形拼接技术有效地缓解了劈裂强度的各向异性，并通过针腿和胯部加固的共同作用提高了滑移强度、延性和吸收能量。然而，由于注入后3DPC浆料的自我恢复能力不足，导致缝线与混凝土基体之间的界面较弱。这些发现加深了对粘性混凝土浆体中钢筋植入的理解，并为优化混凝土3D打印中的钢筋策略提供了有价值的见解。

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

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.