Scientific Quarterly Journal of Iranian Association of Engineering Geology

Scientific Quarterly Journal of Iranian Association of Engineering Geology

Experimental Investigating the Effect of Glass Fibre on Mode I, Mode II, and Mixed Mode (I-II) Fracture Toughness and Crack Propagation in Fibre-Reinforced Concrete

Document Type : Original Article

Authors
Mitra Hatami Jorbat
Mehdi Hosseini
Mahdi Mahdikhani
Imam Khomeini international university
Abstract
Concrete is the most widely-used material in civil engineering and often contains the cheapest and most common matter. It can therefore cause irreparable damages due to cracks and fractures. The creation of fibre-reinforced concrete in recent years has largely rectified the aforementioned shortcomings. This study uses the direct crack Brazilian disk test to evaluate fracture toughness and crack propagation in fibre-free and glass fibre concrete samples in 0.2, 0.35 and 0.5 volume percentages. Moreover, fracture toughness and crack propagation from pre-existing cracks were calculated for samples in mode I, mode II, and mixed mode (I-II). The samples were subjected to the Brazilian disk test at 0, 15, 28.83, 45, 60, 75 and 90-degree angles relative to the pre-existing crack’s trajectory. Laboratory investigations showed that the wing crack at sub 75-degree (0<α <75) angles was initiated from the pre-existing fracture’s tip and approached loading trajectory as the load on the crack growth and propagation trajectory continued. At the same time, crack initiation at 75-degree angles and above begins at a distance of d from the tip, which is greater in fibre-free samples. The results also showed that using 0.2% glass fibre in mode I, II and mixed mode (I-II) resulted in a higher fracture toughness than fibre-free samples.
Keywords
crack propagation
fiber-reinforced concrete
mode I fracture toughness
mode II fracture toughness
mixed mode (I-II) fracture toughness
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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 14, Issue 4
Winter 2022
Pages 39-58

  • Receive Date 12 June 2020
  • Revise Date 04 May 2021
  • Accept Date 20 September 2020