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
Appears on pages(s): 101-110
Keywords: Polypropylene fibre, shear strength, shear deformation, image-measurement.
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.