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Penetration test of sheet-like indenter for yield stress assessment of 3D-printed concrete
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-11-26 , DOI: 10.1016/j.cemconres.2024.107728
Haoyu Lu, Lizhi Zhang, Junkai Wang, Zhaoxin Shi, Wei She, Wenqiang Zuo

The evolution of early mechanical properties of 3D-printed concrete (3DPC) plays a crucial role in early constructability, while current methods face challenges on the tradeoff between the accuracy and feasibility of mechanical properties characterization. In this paper, we designed a sheet-like indenter configuration to quantitatively obtain the yield stress of fresh 3DPC. First, we show the typical force-depth curve of sheet-like indenters obtained during the penetration test and analyze the main factors affecting the penetration resistance at various regimes. Then, we derive the quantitative correlation between the yield stress and the force-depth curve based on numerical simulation. Our results show that the slipping phenomenon between the indenter side and the material leads to an underestimation of the yield stress compared to the standard compression test and cone-shaped indenter. We moreover propose a sheet-like indenter with surface roughness modification to obtain the accurate yield stress value, together with a formula for the yield stress calculation based on the force-depth curve. Finally, we assess the feasibility of the proposed approach, which can robustly predict fresh 3DPC with yield stresses in the range of 1–100 kPa.

中文翻译:


用于 3D 打印混凝土屈服应力评估的片状压头的触探试验



3D 打印混凝土 (3DPC) 早期机械性能的演变在早期可施工性中起着至关重要的作用,而当前方法在机械性能表征的准确性和可行性之间面临权衡挑战。在本文中,我们设计了一种片状压头构型,以定量获得新鲜 3DPC 的屈服应力。首先,我们展示了在触探测试期间获得的片状压头的典型力-深度曲线,并分析了在各种状态下影响触探阻力的主要因素。然后,我们基于数值模拟推导了屈服应力与力-深度曲线之间的定量相关性。我们的结果表明,与标准压缩试验和锥形压头相比,压头侧和材料之间的滑动现象导致低估了屈服应力。此外,我们还提出了一种具有表面粗糙度修改的片状压头,以获得准确的屈服应力值,以及基于力-深度曲线的屈服应力计算公式。最后,我们评估了所提出的方法的可行性,该方法可以稳健地预测 1-100 kPa 范围内屈服应力的新鲜 3DPC。
更新日期:2024-11-26
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