The shear strength of the interface between artificial rock and printed concrete at super-early ages

IF 2.9 3区工程技术 Q2 ENGINEERING, CIVIL Frontiers of Structural and Civil Engineering Pub Date : 2024-05-09 DOI:10.1007/s11709-024-1012-3

Yong Yuan, Xiaoyun Wang, Jiao-Long Zhang, Yaxin Tao, Kim Van Tittelboom, Luc Taerwe, Geert De Schutter

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Abstract

3D concrete printing has the potential to replace shotcrete for construction of linings of tunnels in hard rock. The shear strength of the interface between rock and printed concrete is vital, especially at super-early ages. However, traditional methods for testing the shear strength of the interface, e.g., the direct shear test, are time-consuming and result in a high variability for fast-hardening printed concrete. In this paper, a new fast bond shear test is proposed. Each test can be completed in 1 min, with another 2 min for preparing the next test. The influence of the matrix composition, the age of the printed matrices, and the interface roughness of the artificial rock substrate on the shear strength of the interface was experimentally studied. The tests were conducted at the age of the matrices at the 1st, the 4th, the 8th, the 16th, the 32nd, and the 64th min after its final setting. A dimensionless formula was established to calculate the shear strength, accounting for the age of the printed matrices, the interface roughness, and the shear failure modes. It was validated by comparing the calculated results and the experimental results of one group of samples.

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人工岩石与印模混凝土界面在超早期龄期的抗剪强度

三维混凝土打印有可能取代喷射混凝土，用于在坚硬岩石中建造隧道衬砌。岩石与打印混凝土之间界面的抗剪强度至关重要，尤其是在超早期龄期。然而，测试界面剪切强度的传统方法（如直接剪切试验）不仅耗时，而且会导致快速硬化印模混凝土的高变异性。本文提出了一种新的快速粘结剪切试验。每次试验可在 1 分钟内完成，另外 2 分钟用于准备下一次试验。实验研究了基质成分、印花基质龄期和人工岩石基质界面粗糙度对界面剪切强度的影响。试验分别在基质终凝后的第 1、4、8、16、32 和 64 分钟进行。建立了一个无量纲公式来计算剪切强度，其中考虑到了印刷基质的龄期、界面粗糙度和剪切破坏模式。通过比较一组样品的计算结果和实验结果，对该公式进行了验证。

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来源期刊

Frontiers of Structural and Civil Engineering Engineering-Architecture

CiteScore

5.20

自引率

3.30%

发文量

734

期刊介绍： Frontiers of Structural and Civil Engineering is an international journal that publishes original research papers, review articles and case studies related to civil and structural engineering. Topics include but are not limited to the latest developments in building and bridge structures, geotechnical engineering, hydraulic engineering, coastal engineering, and transport engineering. Case studies that demonstrate the successful applications of cutting-edge research technologies are welcome. The journal also promotes and publishes interdisciplinary research and applications connecting civil engineering and other disciplines, such as bio-, info-, nano- and social sciences and technology. Manuscripts submitted for publication will be subject to a stringent peer review.