Laboratory Study of Fracture Parameters of Ultra-High Performance Fiber Reinforced Concrete

Ebrahimzadeh, Mohsen | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54279 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. High performance concrete has a compressive strength of more than one hundred and twenty MPa. The effect of steel fibers on the flexural fracture of this type of concrete has been studied, but the mechanical behavior of fracture of this material has not been fully studied yet. In this research, the effect of different percentages of propylene fibers on the mechanical properties of reinforced concrete will be investigated experimentaly. For this purpose, beam samples with dimensions of 40*10*10 cm, which had an initial notch with a depth of 3 cm in the lower middle of it, have been tested to investigate the effect of fiber percentage on how the crack propegate and the sample breaks. It is considered the failure energy and other parameters of the test specimens are to be measured. Finally, in order to better understand, a beam sample with 1% steel fibers was made and its fracture data were examined for comparison between propylene fibers and steel fibers.The results showed that the addition of propylene fibers slightly increases the compressive strength, but the effect of these fibers on flexural strength is greater than the compressive strength, however, its effect is negligible in comparison to steel fibers. It has also been observed that propylene fibers cause softening strain as the load approaches the maximum load. Despite this effect, it is not large enough to prevent the crack from propagating, and the crack propagation rate is very high and instantaneous failure occurs during bending.In comparison with steel fibers, it was observed that the flexural fracture energy in concretes with steel fibers is much higher (20 times) than concretes with propylene fibers, and after the initial crack in the concrete with steel fibers, these steel fibers Load bearing participates and causes a higher load bearing (10%) than the initial cracking load
  9. Keywords:
  10. Propylene ; Fracture Mechanics ; Fiber Reinforced Concrete ; Flexural Fracture Mode ; Flexural Strength

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