SHELL CARIPHALTE DM: AN SBS MODIFIED BITUMEN

This article describes a recently developed highly flexible binder which, it is claimed, can improve by a factor of 3 fatigue life of bituminous overlay on cementitious layers. The product is made from a 2 component highly polymer competible bitumen, compounded with 7% of a thermoplastic rubber which is a styrene-butadiene-styrene (SBS) block co-polymer. At low temperatures this binder is more flexible than 50 pen bitumen, and therefore is more resistant to cracking. At high service temperatures it is stiffer than 50 pen bitumen and therefore more resistant to permanent deformation. The product has been found to perform well in a full scale road trial where it was used on a concrete bridge at St Quentin in France in 1976. It was first introduced into Britain in 1986 and has been used prior to overlaying old concrete roadbases on several motorways and trunk roads. Its properties as confirmed by wheel tracking tests at the Transport and Road Research Laboratory (Report LR 989, IRRD 254629) are: penetration at 25 degrees C: 84; softening point (IP): 90 degrees C; wheel tracking rate at 45 degrees C mm/hr: 0.7. It has been shown to be cost effective (in certain circumstances saving up to 45%). See IRRD 814469 for further information on cost effectivenes of the product.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00373516
• Corporate Authors:

  Shell International Petroleum Company Limited

  Shell Center
  London SE1 7NA,   England 
• Authors:
  • WHITEOAK, C D
• Publication Date: 1989-9

Language

• English

Media Info

• Pagination: p. 2-5
• Serial:
  • Shell Bitumen Review
  • Issue Number: 64
  • Publisher: Shell International Petroleum Company Limited
  • ISSN: 0037-3516

Subject/Index Terms

• TRT Terms: Base course (Pavements); Binders; Bitumen; Concrete; Cracking; Deformation; Durability; Economic efficiency; Flexibility; Pavements; Polymers; Stiffness; Strength of materials; Structural strengthening
• Uncontrolled Terms: Flexible
• ITRD Terms: 4948: Binder; 4963: Bitumen; 4755: Concrete; 5211: Cracking; 5595: Deformation; 5910: Durability; 237: Economic efficiency; 7481: Polymerization; 2961: Roadbase; 5931: Stiffness; 3096: Strengthening (pavement)
• Subject Areas: Economics; Highways; Pavements;

Filing Info

• Accession Number: 00498501
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS, ATRI
• Created Date: Sep 30 1990 12:00AM