DEFORMATION RESISTANT HOT ROLLED ASPHALT FOR HEAVILY TRAFFICKED ROADS

Although the volume of traffic on our roads increases year on year, asphalt roads continue to perform well, this is demonstrated by the fact that 95% of roads in the UK are asphalt. However, following the exceptionally hot summer in 1995 the nearside lane of some of our most heavily trafficked motorways and urban arterial roads exhibited deformation in the wheel-tracks. To address this problem the Highways Agency have introduced a draft performance specification for hot rolled asphalt (HRA) wearing course, Clause 943, where the rut rate and total rut depth determined in the wheel-tracking test at 45 degrees C and 60 degrees C are related to the severity of traffic conditions. A laboratory study has been carried out jointly by Tilcon (North), Tilcon (South) and Shell Bitumen to evaluate HRA wearing course made with two modified bitumens; an SBS-modified bitumen, Cariphalte DM and a binder manufactured using a special refinery process, Multiphalte. The paper describes the results of this study in particular: the mechanism of deformation; the improvement in wheel-tracking performance of HRA wearing course achieved by the use of these two modified bitumens; a comparison of the wheel-tracking characteristics of HRA manufactured and compacted in the laboratory and asphalt manufactured on an asphalt plant and compacted on-site; comparison of the laboratory test results with performance on the road. For the covering abstract see IRRD 890024.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/3931681149
• Corporate Authors:

  AEDIFICATIO PUBLISHERS

  IMMENTALSTR 34
  FREIBURG I.BR,   Germany  D-79104
• Authors:
  • ROCKLIFF, D K
  • MYCOCK, K
  • GILES, D
• Conference:
  • PERFORMANCE AND DURABILITY OF BITUMINOUS MATERIALS. PROCEEDINGS OF THE SECOND EUROPEAN SYMPOSIUM ON PERFORMANCE AND DURABILITY OF BITUMINOUS MATERIALS, LEEDS, APRIL 1997
• Publication Date: 1997

Language

• English

Media Info

• Features: References;
• Pagination: p. 559-74

Subject/Index Terms

• TRT Terms: Bitumen; Conferences; Deformation; Durability; Hot coated materials; Pavements; Traffic density; Wearing course (Pavements)
• Uncontrolled Terms: Modifications
• ITRD Terms: 4948: Binder; 4963: Bitumen; 9138: Comfort; 8525: Conference; 5595: Deformation; 5910: Durability; 4997: Hot coated material; 4555: Material (constr); 9048: Modification; 2955: Pavement; 1755: Road user; 3081: Rutting (wheel); 1665: Safety; 187: Specification (standard); 2972: Surfacing; 6288: Test method; 673: Traffic concentration; 8119: United Kingdom; 2980: Wearing course
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00739340
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 3-931681-14-9
• Files: ITRD
• Created Date: Aug 28 1997 12:00AM