The physical processes taking place during the pull-out of steel fibres of various geometries from portland cement paste were studied microscopically by in-situ testing. Two types of specimens were tested: (a) compact tension specimens reinforced with a single short fibre placed in front and perpendicular to cast-in notch, and specimens of a simple pull-out test geometry. Observations by optical microscopy and by SEM indicated that the pull-out processes observed in the compact tension specimen, after it was cracked and the fibre bridged across the crack, were different from those in the simple pull-out test; they showed considerable local bending along the fibres, especially when they were of a geometry containing hooks and ribs. In all types of fibres, the pull-out process observed in the compact tension specimen was non-symmetrical, since the crack induced in the matrix was shifted and subdivided as it crossed the fibre. This is in contrast to the symmetric geometry of the simple pull-out test. (Author/TRRL)

  • Availability:
  • Corporate Authors:

    Construction Press

    Longman House, Burnt Mill
    Harlow, Essex CM20 2JE,   England 
  • Authors:
    • Bentur, A
    • Mindess, S
    • Diamond, S
  • Publication Date: 1985-2

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Filing Info

  • Accession Number: 00396228
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jan 31 1986 12:00AM