MECHANICAL TESTING AND EVALUATION OF HARDICRETE, A SPECIAL ROAD SURFACING MATERIAL

Details are given of conventional tests for stiffness, fatigue life and temperature characteristics carried out to evaluate the properties of 'hardicrete' and produce design guidelines to assist with its practical use. Hardicrete is an open textured bitumen macadam, the voids in which are filled with a resin-cement grout after laying. It is claimed to be more resistant to permanent deformation, oil spillage, has a lower temperature susceptibility and longer lasting skid resistance. Its higher stiffness however can make it prone to cracking in some conditions. The tests showed that its stiffness increased with age for at least 3 1/2 months but decreases with temperature and stress level. It has an endurance limit of 20 microstrains and negligible permanent deformation occurs under repeated stresses of similar magnitude to that expected under traffic loading. An analytical approach to pavement design using the shell laboratory bistro computer program was carried out for both 'hardicrete' and conventional surfacing. It was determined that 'hardicrete' should not be used with an unbound granular base unless a dense bitumen macadam base course at least 60 mm thick is included. If this is the case, it may be used as a wearing course for road note 29 structures with an improved performance. /TRRL/

  • Availability:
  • Corporate Authors:

    Embankment Press Limited

    Building 59, GEC Estate, East Lane
    Wembley, Middlesex HA9 7TQ,   England 
  • Authors:
    • BROWN, S F
    • Pell, P S
    • Boundy, R
  • Publication Date: 1978-5

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 10
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00184519
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 3 1979 12:00AM