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Fracture behavior of monotype and hybrid fiber reinforced self-compacting concrete at different temperatures

  • Mazloom, Moosa (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Karimpanah, Hemin (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Karamloo, Mohammad (Department of Civil Engineering, Shahid Rajaee Teacher Training University)
  • Received : 2019.12.08
  • Accepted : 2020.03.09
  • Published : 2020.04.25
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Abstract

In the present study, the effect of basalt, glass, and hybrid glass-basalt fibers on mechanical properties and fracture behavior of self-compacting concrete (SCC) mixes have been assessed at room and elevated temperatures. To do so, twelve mix compositions have been prepared such that the proper workability, flowability, and passing ability have been achieved. Besides, to make comparison possible, water to binder ratio and the amount of solid contents were kept constant. Four fiber dosages of 0.5, 1, 1.5, and 2% (by concrete volume) were considered for monotype fiber reinforced mixes, while the total amount of fiber were kept 1% for hybrid fiber reinforced mixes. Three different portions of glass and basalt fiber were considered for hybridization of fibers to show the best cocktail for hybrid basalt-glass fiber. Test results indicated that the fracture energy of mix is highly dependent on both fiber dosage and temperature. Moreover, the hybrid fiber reinforced mixes showed the highest fracture energies in comparison with monotype fiber reinforced specimens with 1% fiber volume fraction. In general, hybridization has played a leading role in the improvement of mechanical properties and fracture behavior of mixes, while compared to monotype fiber reinforced specimens, hybridization has led to lower amounts of compressive strength.

Keywords

Acknowledgement

The authors confirm no conflict of interest. Besides, the authors declare that this study received no funding or financial support from any funding body or organization.

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