WHAT DO WE MEAN BY FLEXIBLE ASPHALT? AN ANSWER TO MOTORWAY BRIDGE JOINT PROBLEMS

The effect of new flexible binders in preventing deformation of asphalt at high temperatures and cracking at low temperatures are discussed. A combination of high penetration index and high ductility at 0 deg C is required. It was found that by the addition of a fluxed polymer (trade name asphapol) an open texture wearing course could be produced with the same durability as hot rolled asphalt with pre-coated chippings. It could have the added advantage of a higher skid resistance, produce less spray in wet conditions and have a good resistance to surface deformation at all temperatures. It would also have a better resistance to reflective cracking when used over sub-bases with vertical joint movement up to 20 mm. Trials using a 20 mm asphapol cushion course at buried joints on an elevated section of motorway are described. Preliminary results are encouraging. The author suggests that a 15 mm cushion course and 30 mm of polymer asphalt cement open texture wearing course would absorb the vibration that tends to shatter normal asphalt. /TRRL/

  • Availability:
  • Corporate Authors:

    Embankment Press Limited

    Building 59, GEC Estate, East Lane
    Wembley, Middlesex HA9 7TQ,   England 
  • Authors:
    • Buckmaster, C
  • Publication Date: 1978-7

Media Info

  • Features: Photos; Tables;
  • Pagination: p. 10-13
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00189250
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 12 1979 12:00AM