Flexibility proposed to solve aggregate problem

The extensive use of thin surfacing in the United Kingdom has led to difficulties in sourcing high value PSV (polished stone value) aggregates. Hot rolled asphalt (HRA) surfacing of a three lane motorway with hard shoulder required approximately 180t of 20 mm precoated chippings of 56 PSV or higher per kilometre. A 40 mm layer of thin surfacing for the same area required 1000t of similar aggregate. Most of the high value PSV used is 10 and 14 mm size. Tarmac is looking at extending the size range used in thin surfacings to 2-20 mm in order to increase sustainability. The 6 mm thin surfacings, e.g. Tarmac's 6 mm Masterflex, are suitable for roads with low speed limits, with the benefits of increased contact area between road and tyre and reduced noise. Tarmac has developed a 20 mm variant of its Masterpave system that has been trialled on the M42 motorway. Applications include use as a 60 mm combined regulating binder course/surface course layer for strengthening and rehabilitating minor roads.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/14784467
• Authors:
  • LOVEDAY, C
• Publication Date: 2004-7

Language

• English

Media Info

• Pagination: 20-2
• Serial:
  • TRANSPORTATION PROFESSIONAL
  • Publisher: BARRETT, BYRD ASSOCIATES
  • ISSN: 1478-4467

Subject/Index Terms

• TRT Terms: Aggregates; Coefficients; Durability; Freeways; Highways; Maintenance; Polished aggregates; Size; Speed; Surfacing; Sustainable development
• Geographic Terms: United Kingdom
• ITRD Terms: 4577: Aggregate; 6410: Coefficient; 9014: Dimension; 5910: Durability; 2755: Highway; 3847: Maintenance; 2752: Motorway; 3822: Polishing; 5408: Speed; 2972: Surfacing; 2427: Sustainability; 8119: United Kingdom
• Subject Areas: Geotechnology; Highways; Maintenance and Preservation; Materials; I31: Bituminous Binders and Materials; I36: Aggregates;

Filing Info

• Accession Number: 01011886
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Dec 20 2005 11:29AM