Following laboratory investigations into the properties of rubberized binders at the Road Research Laboratory, in co-operation with the Natural Rubber Producers' Research Association and the former Natural Rubber Bureau, a number of full-scale road experiments using rubberized surfacing materials have been conducted during the last seventeen years. The results of these experiments are reviewed in this report. The addition of rubber to mastic asphalt prevents or markedly reduces cracking occurring when a bituminous surfacing is laid over joints or cracks in a concrete pavement. The best results have been obtained when the highest binder content consistent with resistance to deformation under traffic has been used. The addition of 4 per cent of natural rubber to the binder of rolled asphalt considerably reduces the number and severity of cracks in this surfacing material when laid over joints and cracks in a concrete pavement. A 50 per cent increase in life of bitumen macadam was obtained in one experiment when 4 per cent of rubber was added to the binder. A second experiment with 2 1/2 per cent of rubber was however inconclusive. A limited full-scale experiment has suggested that the life of dense tar surfacing may be increased by the addition of rubber powder to the binder. A change in traffic distribution over the site has unfortunately made direct comparison of the experimental and control materials impossible. No significant advantage has been gained from the use of rubber or methacrylate-graft -rubber in tar surfacing dressing. A considerable reduction in the tendency of bitumen surface dressings to 'fat up' in hot weather under heavy traffic was shown when rubber was blended with the binder. An increased initial holding power of the binders containing rubber was observed. Rubberized bitumen binders have shown no advantage on lightly-trafficked roads.

  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • Thompson, P D
  • Publication Date: 1971


  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 40 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00081124
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: No. LR 370
  • Files: ITRD, TRIS, ATRI
  • Created Date: Mar 26 1975 12:00AM