DESIGN AND PERFORMANCE OF SPRAYED SEAL COATS FOR UNBOUND GRANULAR PAVEMENTS CARRYING HEAVY LOGGING TRUCKS

Virtually all of New Zealand's highway pavements usually consist of one or more coats of a sprayed seal over unbound granular layers. The standard New Zealand design and construction techniques are being applied to heavy-duty forestry roads. In a recent case study, a private forestry arterial road carrying heavily loaded logging trucks was examined. The advantages and limitations of New Zealand's approach to seal coat design with respect to the forestry roads are discussed. Bitumen application rates calculated from national highway design algorithms resulted in flushing in the arterial forestry roads because the surface treatment contains excess bitumen for the axle loads. Experimental work that has been instigated to further the development of seal coat design, construction techniques, and specialized equipment suited to the special requirements of forestry roads sustaining heavy loads is discussed. The concept of cover aggregate embedment and surface hardness is also considered.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1991/1291vol1/1291-046.pdf
• Record URL:
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  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309050715
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1291, Fifth International Conference on Low-Volume Roads, May 19-23, 1991, Raleigh, North Carolina, Volume 2. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Corporate Authors:

  Transportation Research Board

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• Authors:
  • Pidwerbesky, B D
  • Pollard, J S
• Publication Date: 1991

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 66-71
• Serial:
  • Transportation Research Record
  • Issue Number: 1291
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Aggregates; Anchoring; Case studies; Conferences; Construction equipment; Construction management; Flushing; Forest roads; Hardness; Highway design; Logging roads; Low volume roads; Seal coats; Surfaces
• Uncontrolled Terms: Embedment; Surface hardness
• Geographic Terms: New Zealand
• Old TRIS Terms: Cover aggregate
• Subject Areas: Construction; Design; Geotechnology; Highways; Maintenance and Preservation; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00611784
• Record Type: Publication
• ISBN: 0-309-05071-5
• Files: TRIS, TRB, ATRI
• Created Date: Aug 31 1991 12:00AM