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Research Article

Fracture behavior of hybrid fiber reinforced normal strength and high strength concrete: comparison with plain and steel fiber reinforced concrete

P.N. Ojha, Pranay Singh, Brijesh Singh, Abhishek Singh

Centre for Construction Development and Research, National Council for Cement and Building Materials, India

Keywords

Abstract


HFRHSC;


Fracture;


Load-CMOD;


Three-point bend test

The paper presents an experimental investigation on the fracture behavior of hybrid-fiber reinforced normal strength concrete (HFRC) and hybrid-fiber reinforced high strength concrete (HFRHSC). The hybrid fiber used in the study constitutes of 0.75% steel fiber and 0.25% polypropylene fiber, by volume of the concrete. A three-point bend test on a notched beam has been performed based on the recommendations of RILEM as well as literature. Fracture parameters like the fracture energy, stress intensity factor, energy release rate and characteristic length has been evaluated from the load-deflection and load-CMOD curves. These were compared with values for the plain and steel fiber reinforced concrete reported in literature for similar type of mixes. Result suggests that hybrid fiber improved the fracture performance in comparison to the steel fiber reinforcement in case of normal strength concrete. For higher strength concrete, replacing steel fiber by hybrid fibers caused marginal reduction in the fracture parameters. Compared to plain unreinforced concrete, the fracture behaviour irrespective of the strength improved by addition of the hybrid fibers.

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01/01/2024 Best Paper Award: The winners of 2023 Best Paper Award of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Author Awards section.


01/01/2024 Most Cited Paper Award: The winners of 2023 Most Cited Paper Award of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Author Awards section.


01/01/2024 Reviewer Awards: The winners of 2023 reviewer awards of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Reviewer Awards section.


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2023 Reviewer Awards:

Please, visit Reviewer Awards section for the winners of the 2022 RESM reviewer awards.



2023 Best Paper Award:

The paper authored by Ferzan Fidan, Naim Aslan, Mümin Mehmet Koç entitled as “Morpho-structural and compressive mechanical properties of graphene oxide reinforced hydroxyapatite scaffolds for bone tissue applications” is awarded.



2023 Most Cited Paper Award:

The paper authored by Ercan Işık, Ehsan Harirchian, Hüseyin Bilgin, Kirti Jadhav entitled as “The effect of material strength and discontinuity in RC structures according to different site-specific design spectra" is awarded.


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