ROAD TRIALS OF THIN WEARING COURSE MATERIALS

This report describes a series of road trials of two proprietary thin surfacing techniques, UL-M (1 site) and Safepave (7 sites), and summarises the performance of the materials during their early service life. Most of the claims for the materials appear to be confirmed, but there are reservations regarding surface texture. Visual surveys on these heavily trafficked sites generally show significant consolidation of material in the wheel-paths; however, low-speed (50 km/h) skidding resistance measured using SCRIM is unaffected and is being maintained at an acceptable level in all cases. Monitoring to date shows generally good integrity and adhesion of the surfacing. However, isolated areas of material loss have been observed, particuarly at junctions, on some Safepave sites where turning vehicles have caused scuffing and pull-out of material. Where Safepave was used on a jointed concrete pavement, the technique of saw-cut and seal at expansion joints appears to be the most effective method for minimising reflective cracking at joints. On some of the flexible construction Safepave sites, no pre-treatment was carried out to cracks in the surface or to other defects and consequently many defects have re-appeared, necessitating further maintenance. Preliminary maintenance and minor repairs prior to the application of Safepave will assist in ensuring maximum life from the new surfacing. (A)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09684093
• Corporate Authors:

  TRL

  Crowthorne House, Nine Mile Ride
  Wokingham, Berkshire  United Kingdom  RG40 3GA
• Authors:
  • Nicholls, J C
  • POTTER, J F
  • CARSWELL, J
  • LANGDALE, P
• Publication Date: 1995

Language

• English

Media Info

• Features: References;
• Pagination: 27 p.
• Serial:
  • TRL PROJECT REPORT
  • Issue Number: PR 79
  • Publisher: TRL
  • ISSN: 0968-4093

Subject/Index Terms

• TRT Terms: Adhesion; Bituminous materials; Experimental roads; Motor vehicles; Skid resistance; Sound level; Splashing; Surfacing; Thickness; Wearing course (Pavements)
• ITRD Terms: 5942: Adhesion; 4955: Bituminous materials; 2778: Experimental road; 3031: Skid resistance; 6747: Sound level; 9146: Spray (veh); 2972: Surfacing; 5933: Thickness; 2980: Wearing course
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 00711173
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, ATRI
• Created Date: Sep 20 1995 12:00AM