Computers and Concrete

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Experimental and numerical investigation on the thickness effect of concrete specimens in a new tensile testing apparatus

  • Lei, Zhou (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University) ;
  • Hadi, Haeri (Department of Mining Engineering, Higher Education Complex of Zarand) ;
  • Vahab, Sarfarazi (Department of Mining Engineering, Hamedan University of Technology) ;
  • Mohammad Fatehi, Marji (Department of Mine Exploitation Engineering, Faculty of Mining and Metallurgy, Institute of Engineering, Yazd University) ;
  • A.A., Naderi (Department of Mining Engineering, Hamedan University of Technology) ;
  • Mohammadreza Hassannezhad, Vayani (Department of CIvil Engineering, University of Tabriz)
  • Received : 2022.05.08
  • Accepted : 2022.11.17
  • Published : 2023.01.25
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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 mm×190 mm (width×height) 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.

Keywords

Acknowledgement

This work was financially supported by the National Natural Science Foundation of China (52204104), the Open Project of State Key Laboratory of Coal Mine Disaster Dynamics and Control (2011DA105287-FW201905), the Science and Technology Department of Sichuan Province (2023YFH0022), the Open Fund of Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province (20kfgk01), the State Key Laboratory for Geo-Mechanics and Deep Underground Engineering, China. University of Mining & Technology (SKLGDUEK2111), the Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology (SKLGP2021K009), the Sichuan University postdoctoral interdisciplinary Innovation Fund.

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