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Investigating the Tensile Behaviour of a Type of Fibre-Reinforced Concrete

Irandoust, Mohammad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51639 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khonsari, Vahid
  7. Abstract:
  8. Low tensile strength and also low strain capacity make plain concrete a ‘brittle’ material. To overcome this shortcoming, the addition of fibre as a reinforcing material has proved to be a reasonable solution. One of the crucial factors in deciding to make this type of concrete is the cost of fibre, which varies depending on its type. In this project a special type of fibre which does not cost a lot and at the same time has a high strength has been used. To investigate the effect of the fibre on the tensile strength of concrete, splitting tensile test (Brazilian test) was adopted. Altogether, 30 standard cylindrical specimens with dimensions of 15 × 30 cm2 were made (3 of each type) which contained fibres of 3, 4, or 5 cm length. Besides, the amount of used fibres was 0.0% (fibre-less), 0.5%, 1.0% or 1.5% of the ‘volume’ of the ‘paste’ of concrete. Diameter-wise the fibres were of two groups, 0.57 mm (thin fibres) and 1.23 mm (thick fibres), hence the aspect ratios were 24 (for 3-cm long thick fibres), 33 (for 4-cm long thick fibres) and 88 (for 5-cm long thin fibres), respectively. After curing the specimens and reaching the strength of 28 days, and prior to their mechanical testing, they were subjected to ultrasonic testing. The results of the experiments indicate that, the higher the amount of fibre in concrete, the higher the tensile strength, and, from another perspective, increasing the length of the fibres, i.e. the aspect ratio, again increases the tensile strength and, consequently, increases the toughness. To be more specific, the average amounts of increase in tensile strength of fibre-reinforced specimens were 35% (for 0.5% fibre content, fc), 30% (for 1.0% fc) and 61% (for 1.5% fc) when 3-cm fibres were used, whereas these figures were -2%, 44% and 46% respectively when 4-cm fibres were used and 31%, 92% and 111% respectively when 5-cm long fibres were used
  9. Keywords:
  10. Fiber Reinforced Concrete ; Tensile Strength ; Splitting Tensile Test ; Toughness ; Ultrasonic Test

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