SOFT BITUMEN WITH LOW VOLATILE FLUX. CHARACTERIZATION AND EXPERIENCE FROM USE ON SECONDARY ROADS --BITUMEN, FLEXIBLE AND DURABLE. 3RD EUROBITUME SYMPOSIUM 1985, THE HAGUE, NETHERLANDS, SEPTEMBER 11-13, 1985

Most countries have a broad experience with different types of soft bituminous binders. Historically there has been a move from tar oil modified binders to cutbacks. In Norway road oils, slow curing cutback types, have been commonly used. Road oil and cut-back applications counts for nearly 1/4 of total Norwegian road pavement market. The cutback and road oil technology suffers from major disadvantages due to uncontrolled curing properties of these solvent containing bituminous binders. The aimed binder softness for different applications, after curing on the road for approximately 2 years, has been determined from road samples. Based on these findings we have fixed end product specifications for binder viscosity. The range of bituminous binders to meet these specifications, has been composed from straight bitumens mixed with low volatile petroleum based fluxes. These fluxes may be of bunker c-type, collected from the bottom of the atmosphere distillation column or preferably a vacuum distillate. The resistance to curing has been measured by a modified thin film oven test at temperatures of 60 deg, 90 deg/120 deg C and 163 deg c. The obtained curing curve, together with the viscoity/temperature curve, has been used as a tool for considering the suitability of different fluxes and soft bitumen qualities. Viscosity ranges of soft bitumens now in common use are from 500 mm2/sec -12.000 mm2/sec at 60 deg c. The different grades are either supplied as such from a mixing depot or blended directly in the mixer from a straight bitumen quality and a low viscosity soft bitumen (500 or 1.500 mm2/sec). The soft bitumen are used as such or emulsified. The range of applications, where soft bitumens are used, are hot/semihot mixes, cold mixes and surface dressings. Since the starting up in 1981 approximately 1/3 of total cutback/road oil applications have been converted to soft bitumen applications with extremely good results.(a) for the covering abstract of the symposium see IRRD 815173.

• Corporate Authors:

  EUROBITUME

  BD EMILE BOCKSTAEL 351
  Bruxelles, ZZ Belgique   
• Authors:
  • Hattestad, J O
  • Sandvik, J
• Publication Date: 1985

Language

• Undetermined

Media Info

• Pagination: p. 83-7
• Serial:
  • Publication of: EUROBITUME
  • Publisher: EUROBITUME

Subject/Index Terms

• TRT Terms: Binders; Bitumen; Concrete curing; Conferences; Flux oil; Liquid asphalt; Oils; Secondary roads; Soft soils; Temperature; Viscosity
• Geographic Terms: Norway
• Subject Areas: Data and Information Technology; Highways;

Filing Info

• Accession Number: 00482070
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Apr 30 1989 12:00AM