DEFORMED STEEL FIBER-CEMENTITIOUS MATRIX BOND UNDER IMPACT

This article describes research which studied the behaviour of steel fibre reinforced concrete under impact. Special attention is given to the effect upon fibre behaviour of the pull out rate used in the test. Single fibre pull out specimens were prepared by positioning the steel fibre in a mould using a 0.5 mm plastic separator, pouring the plastic matrix, and lightly vibrating the mould for about 30 seconds. Several matrix and fibre types were used. Very high rates of pull out were studied using dynamic tests conducted on a Charpy impact tester with a modified support system. All of the tests were conducted at a pendulum approach velocity of 1.5 meter/sec. The results of these tests were compared with those obtained from static tests carried out in a table mounted Instron. A pull out rate of 0.00000846 meter/sec was used throughout. This gave a pull out rate ratio (impact/static) of 178000. A comparison of the results obtained by the two different tests indicates that deformed steel fibres embedded in cementitious matrices in general support a higher load under impact than under static pull out. The pull out energy is also greater under impact provided that the fibre failure mode is maintained from static to impact loading. Under certain conditions, however, the fibre failure mode may change and the energy absorption values under impact may be considerably lower than those obtained statically. (TRRL) (Author/TRRL)

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • Banthia, N
    • TROTTIER, J F
  • Publication Date: 1991-1

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00623767
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 31 1992 12:00AM