AN ANALYSIS OF SINGLE-COAT SEAL DESIGN. NEW ZEALAND ROADING SYMPOSIUM 1987. VOLUME 2

This paper presents and reviews the findings of analysis of single-coat seal design carried out on seals applied in Dunedin City in 1984, Ohinemuri County in 1986, and Lower Hutt City in 1985 and 1986. The main conclusions of this analysis: (a) suggest that for a new single-coat seal there is a minimum % of binder filled voids required at the beginning of the first winter in order for the seal to hold a full chip coverage through that winter; and (b) show that there is a relationship between void volume and the total number of traffic passes between application time and the beginning of the first winter and that this relationship is significantly affected by the initial viscosity of the reseal binder. The method of analysis is not entirely new. It analyses the performance of actual seals (as opposed to laboratory simulations), which means that it takes into account all of the local variations in practice and materials. As these variations from one authority and/or district to another are very real the authors' strongly recommend that roading engineers, materials engineers and sealing practitioners be encouraged to carry out their own analysis of their own seals and if at all possible, that this be co-ordinated at a national level. Where possible, the Canterbury test track should be utilised to provide further data for analysis, especially data to do with the effects of heavy commercial traffic. The combination of data from the above recommendations would enable the fine tuning of existing design methods and/or the modifying of practices and materials to enable the kind of single-coat seal to be applied which gives the best value for money. For the covering abstract of the symposium see IRRD 810782. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0477071562
• Corporate Authors:

  National Roads Board, New Zealand

  P.O. Box 12-041
  Wellington,   New Zealand 
• Authors:
  • Houghton, L D
  • HALLETT, J E
• Publication Date: 1987

Media Info

• Features: References;
• Pagination: p. 249-263
• Serial:
  • Publication of: UNITED NATIONS
  • Publisher: United Nations
  • ISSN: 0252-4392

Subject/Index Terms

• TRT Terms: Binders; Conferences; Design methods; Field tests; Performance; Seal coats; Traffic loads; Viscosity; Void ratios
• Old TRIS Terms: Void
• ITRD Terms: 4948: Binder; 3612: Coating; 8525: Conference; 3666: Construction method; 6226: In situ; 1236: Lorry; 4714: Mix design; 8079: New Zealand; 9054: One; 5938: Porosity; 2973: Sealing coat (on top of the surfacing); 2789: Test track; 755: Traffic; 9086: Variability; 5936: Viscosity
• Subject Areas: Design; Freight Transportation; Highways; Pavements;

Filing Info

• Accession Number: 00476387
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-477-07156-2
• Files: ITRD, TRIS
• Created Date: Sep 30 1988 12:00AM