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Computers and Concrete Volume 31, Number 1, January 2023 , pages 71-84 DOI: https://doi.org/10.12989/cac.2023.31.1.071 |
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Experimental and numerical investigation on the thickness effect of concrete specimens in a new tensile testing apparatus |
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Lei Zhou, Hadi Haeri, Vahab Sarfarazi, Mohammad Fatehi Marji, A.A. Naderi and Mohammadreza Hassannezhad Vayani
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| Abstract | ||
| In this paper, the effects of the thickness of cubic samples on the tensile strength of concrete blocks were studied using experimental tests in the laboratory and numerical simulation by the particle flow code in three dimensions (PFC3D). Firstly, the physical concrete blocks with dimensions of 150 mmx190 mm (widthxheight) were prepared. Then, three specimens for each of seven different samples with various thicknesses were built in the laboratory. Simultaneously with the experimental tests, their numerical simulations were performed with PFC3D models. The widths, heights, and thicknesses of the numerical models were the same as those of the experimental samples. These samples were tested with a new tensile testing apparatus. The loading rate was kept at 1 kg/sec during the testing operation. Based on these analyses, it is concluded that when the thickness was less than 5 cm, the tensile strength decreased by increasing the sample thickness. On the other hand, the tensile strength was nearly constant when the sample thickness was raised to more than 5 cm (which can be regarded as a threshold limit for the specimens' thickness). The numerical outputs were similar to the experimental results, demonstrating the validity of the present analyses. | ||
| Key Words | ||
| new tensile testing apparatus; PFC3D; simulation; tensile strength; thickness effect | ||
| Address | ||
| Lei Zhou: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Failure Mechanics and Engineering Disaster Prevention, Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu 610065, China Hadi Haeri: Department of Mining Engineering, Higher Education Complex of Zarand, Zarand, Iran Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran Mohammad Fatehi Marji: Department of Mine Exploitation Engineering, Faculty of Mining and Metallurgy, Institute of Engineering, Yazd University, Yazd, Iran A.A. Naderi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran Mohammadreza Hassannezhad Vayani: Department of CIvil Engineering, University of Tabriz, Tabriz, Iran | ||