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Title: Shear crack behaviour and shear deformation of polypropylene fibre-reinforced concrete slender beams

Author(s): Ortiz-Navas, F.; Navarro-Gregori, J.; Serna Ros, P.; Leiva Herdocia, G.

Publication: Symposium Paper

Volume: 343


Appears on pages(s): 101-110

Keywords: Polypropylene fibre, shear strength, shear deformation, image-measurement.


Date: 10/1/2020

In recent years, much research has shown improvements in shear behaviour and deformation capability when an adequate amount of macro fibres is provided in concrete. However, very few experiments have used macro synthetic fibres. In this paper, the shear capability of deformation in slender beams was studied by analysing the shear crack path, the crack openingslip relationship and shear deformation of polypropylene fibre-reinforced concrete (PFRC) beams. Shear cracks and deformations were measured by non-contact image measurement techniques. The results are compared with those of plain concrete (PC), steel fibre-reinforced concrete (SFRC) and reinforced concrete (RC) beams. Both types of fibres were dosed so that similar average residual tensile strengths would remain similar to one another. The crack path analysis results showed that synthetic fibres delayed the formation of shear cracks and their propagation into compression zone, and improved the behaviour of secondary cracks due to loss of bond with longitudinal reinforcement. Finally, the crack opening-slip relationship varied widely along the crack and location in beams.