Brief details are given of the use of steel fibres in two major projects in Japan, the 8500 M Ena-San tunnel and the Kuroiso by-pass, national highway no 4, in Tochigi prefecture. The steel fibre, tesusa, is claimed to have an improved rectangular configuration giving better bonding and other advantages. Tesusa was used in the repair of the Ena-San tunnel lining which had cracked due to earth pressures of 70-100 tons/square metre. A mixing ratio of 1.5 per cent by volume showed a compressive strength of 400 kg/sq.cm and a bending strength of 100 kg/sq.cm. At the end of November 1975, tesusa-reinforced concrete was used on A trial basis for paving the Kuroiso by-pass in tochigi prefecture. The test road had an overall length of 140 metres and a width of 7.5 metres. For the "a" section, concrete mixed with tesusa in a ratio of 82.5 kilograms per one cubic metre of concrete was used; for the "b" section, approx 56 kilograms per one cubic metre of concrete plus expansion agents. "a" section had one joint at the centre and "b" section had no joint. Coarse aggregate, maximum size 25 mm, was used in the mixing. /TRRL/

  • Corporate Authors:

    Embankment Press Limited

    Embankment House, 3 Caledonian Road
    London,   England 
  • Publication Date: 1976-6


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00142439
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Jul 19 1977 12:00AM