Structural Engineering and Mechanics

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Mechanism of failure in the Semi-Circular Bend (SCB) specimen of gypsum-concrete with an edge notch

  • Fu, Jinwei (School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power) ;
  • Sarfarazi, Vahab (Department of Mining Engineering, Hamedan University of Technology) ;
  • Haeri, Hadi (State Key Laboratory for Deep GeoMechanics and Underground Engineering) ;
  • Marji, Mohammad Fatehi (Department of Mine Exploitation Engineering, Faculty of Mining and metallurgy, Institute of Engineering, Yazd University) ;
  • Guo, Mengdi (School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power)
  • Received : 2020.07.19
  • Accepted : 2021.11.02
  • Published : 2022.01.10
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Abstract

The effects of interaction between concrete-gypsum interface and edge crack on the failure behavior of the specimens in senicircular bend (SCB) test were studied in the laboratory and also simulated numerically using the discrete element method. Some quarter circular specimens of gypsum and concrete with 5 cm radii and hieghts were separately prepared. Then the semicircular testing specimens were made by attaching one gypsum and one concrete sample to one another using a special glue and one edge crack is produced (in the interface) by do not using the glue in that part of the interface. The tensile strengths of concrete and gypsum samples were separately measured as 2.2 MPa and 1.3 MPa, respectively. during all testing performances a constant loading rate of 0.005 mm/s were stablished. The proposed testing method showed that the mechanism of failure and fracture in the brittle materials were mostly governed by the dimensions and number of discontinuities. The fracture toughnesses of the SCB samples were related to the fracture patterns during the failure processes of these specimens. The tensile behaviour of edge notch was related to the number of induced tensile cracks which were increased by decreasing the joint length. The fracture toughness of samples was constant by increasing the joint length. The failure process and fracture pattern in the notched semi-circular bending specimens were similar for both methods used in this study (i.e., the laboratory tests and the simulation procedure using the particle flow code (PFC2D)).

Keywords

Acknowledgement

This work was financially supported by National Natural Science Foundation of China (Grant No. 51608117), Key Specialized Research and Development Breakthrough Program in Henan province (Grant No. 192102210051).

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