Torsion tests were carried out on square and rectangular concrete beams reinforced with crimped steel fibres having aspect ratios of 50. Four concrete mixes with compressive strengths of 12-65 n/sq mm were used; the volume of steel fibres incorporated in the mix ranged from 0.5% to 2.0%. The test beams had square and rectangular cross sections 100 mm by 100 mm and 100 mm by 50 mm respectively. Sufficient cubes and cylinders were cast out of each mix, cured alongside the beams for at least 28 days and tested on the same day as the beams. The beams were tested on specially fabricated rigs capable of applying pure torsion in small load increments. The instrumentation was designed to monitor the loads, deflexions, angles of twist and the propagation of cracks. The general pattern of torque-twist diagrams up to failure was similar to a second degree curve. Unlike plain concrete beams, the fibre-reinforced beams had a considerable post-ultimate reserve; the total collapse of the beams occurred only after pronounced rotations. (Author/TRRL)

Media Info

  • Features: References;
  • Pagination: p. 1043-44
  • Serial:
    • Volume: 69
    • Issue Number: PT2

Subject/Index Terms

Filing Info

  • Accession Number: 00330844
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM