FIBER PULL OUT MECHANISMS: EFFECTS OF FIBER GEOMETRY, LOADING RATE AND SUB-ZERO TEMPERATURES. FIBRE REINFORCED CEMENTS AND CONCRETES: RECENT DEVELOPMENTS. PROCEEDINGS OF AN INTERNATIONAL CONFERENCE HELD AT THE UNIVERSITY OF WALES, COLLEGE OF CARDIFF, SCHOOL OF ENGINEERING, UNITED KINGDOM, SEPTEMBER 18-20, 1989

Bond-slip relationships for six types of fibers embedded in cementitious matrices were studied by conducting pull out tests. Eight matrix types were studied. Fibers ranged from simple straight to excessively deformed. Pull out tests were conducted at two rates of pull out, 8.46 x 10--6 m/s and 2.12 x 10--6 m/s. Some tests were also done in an environmental chamber at -50 deg c. In all of the tests, the load-extension curves were obtained. While the straight undeformed fibers grossly under-utilize the potential of steel, excessively deformed fibers were often found to fracture, substantially reducing the energy absorption capacity. High loading rates and low temperatures generally led to an increase in the observed peak pull out loads, which in turn led to increased instances of fiber facture and matrix failure. Addition of silica fume, although improved the quality of shear or adhesional bond, also led to premature matrix splitting in the case of excessively deformed fibers, causing substantial reductions in the energy absorption. At subzero temperatures, this brittleness of silica fume paste was found to have increased.(A) For the covering abstract of the conference see IRRD 827953.

  • Availability:
  • Corporate Authors:

    Elsevier Science Publishers

    Crown House, Linton Road
    Barking, Essex IG11 8JU,   England 
  • Authors:
    • Banthia, N
    • Trattier, J F
    • Pigeon, M
  • Publication Date: 1989

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00604685
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 1-85166-415-7
  • Files: ITRD, TRIS
  • Created Date: Feb 28 1991 12:00AM