BITUMEN - THERMOPLASTIC RUBBER BLENDS IN ROAD APPLICATIONS --BITUMEN, FLEXIBLE AND DURABLE. 3RD EUROBITUME SYMPOSIUM 1985, THE HAGUE, NETHERLANDS, SEPTEMBER 11-13, 1985

Increasing axle loads and traffic densities are reducing the service lives of asphalt surfacings. To resist permanent deformation at elevated temperatures and fracture at low temperature, places conflicting requirements on bitumen which, because it is viscoelastic, cannot accommodate both fully. Attempts to overcome this limitation have been manifold, including, air blowing, addition of sulphur, fibrous materials, natural rubber, natural asphalt, thermoplastics and thermosetting resins. In recent years there has been a rapid growth in the use of polymer modified bitumens in road applications and within this category, this paper deals with one of the more common modifications; styrene butadiene styrene (sbs) block copolymer, thermoplastic rubber. Sbs is a very suitable polymer for incorporating into bitumen because of its high strength and elasticity at road service temperatures and low viscosity at mix temperatures. The latter property enables a range of polymer contents to be used, according to performance requirements, without a need to adjust mixing, laying or compaction procedures. For more than twenty years shell laboratories have studied the parameters governing the optimum combination of sbs and bitumen. This has resulted in a range of sbs-bitumen blends which are thermally and transport stable and which can be used in place of bitumen in road surfacings and applied by conventional road equipment. Great emphasis has been placed on the practical application and performance of these binders and during the last sixteen years many major road trials have been carried out. In the paper there are given examples of the many applications for which these binders have been used including: -dense asphalt mixes -thin overlays -open friction courses -surface dressings -stress absorbing membranes (sam) -stress absorbing interlayers (sami) - bridge deck membranes.(a) for the covering abstract of the symposium see IRRD 815173.

• Corporate Authors:

  EUROBITUME

  BD EMILE BOCKSTAEL 351
  Bruxelles, ZZ Belgique   
• Authors:
  • Dinnen, A
• Publication Date: 1985

Language

• Undetermined

Media Info

• Pagination: p. 645-51
• Serial:
  • Publication of: EUROBITUME
  • Publisher: EUROBITUME

Subject/Index Terms

• TRT Terms: Absorption; Binders; Bitumen; Bituminous mixtures; Bridge decks; Conferences; Elasticity (Mechanics); High strength; Pavements; Polymers; Rubber; Seal coats; Stability (Mechanics); Strength of materials; Stresses; Structural strengthening; Surfacing; Thermoplastic materials; Viscosity
• Uncontrolled Terms: Membranes
• Old TRIS Terms: Membranes (Biology)
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00482169
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Apr 30 1989 12:00AM