New method for determining the Mode-I fracture toughness of shotcrete: edge notched partial disc test

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2023-12-08 DOI:10.1680/jmacr.23.00004

Mohammad Omidi Manesh, V. Sarfarazi, N. Babanouri, Amir Rezaei, Arsham Moayedi Far

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Abstract

Fracture toughness (first mode) of shotcrete samples was obtained employing Edge Notched Partial Disc (ENPD) type specimens. Notched Brazilian Discs (NBD) were also used in order to validate the results of the conducted ENPD experiments. Moreover, a numerical analysis was conducted on the ENPD tests to verify the correctness of the measured fracture toughness values compared to numerically obtain ones. Notch lengths in ENPD were set to 15, 30, 45 and 60 mm. However, the lengths of Notches in NBD were set to 10, 20, 30, 40, 50 and 60 mm. The findings reveal that the flat joint model could accurately determine the potential crack growth path and crack initiation stress compared to experimentally obtained results. It was also deduced that the fracture toughness remained roughly the same by enlarging the length of the notch. Moreover, tensile strength and fracture toughness of shotcrete samples are meaningfully correlated (σt =7.92 KIC). ENPD test yields the lowest fracture toughness because of pure tensile stress distribution on failure surface. It also was also determined that the derived fracture extension patterns from the laboratory investigations are in an acceptable agreement with the numerical simulations’ outputs.

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确定喷射混凝土 I 型断裂韧性的新方法：边缘缺口部分圆盘试验

采用边缘缺口部分圆盘(ENPD)型试样获得喷射混凝土试样的断裂韧性(第一模态)。为了验证所进行的ENPD实验结果，还使用了缺口巴西盘(NBD)。此外，还对ENPD试验进行了数值分析，以验证实测断裂韧性值与数值计算结果的正确性。ENPD的切口长度设置为15、30、45和60 mm。然而，NBD中的切口长度被设置为10、20、30、40、50和60毫米。结果表明，与实验结果相比，平面节理模型能够准确地确定潜在裂纹扩展路径和裂纹起裂应力。同时还推导出，增大缺口长度后，断裂韧性基本保持不变。喷射混凝土试样的抗拉强度与断裂韧性呈显著相关关系(σt =7.92 KIC)。由于纯拉应力分布在破坏面上，ENPD试验的断裂韧性最低。实验室研究得出的裂缝扩展模式与数值模拟结果吻合良好。

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

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.