EVALUATION OF MODIFIED SINGLE SEAL SURFACE TREATMENTS. FINAL REPORT

This report describes a field study of a multicourse asphalt emulsion chip seal, designated as a modified single seal. The treatment, already used in North Carolina, consists of an application of emulsion and coarse aggregate followed by another application of emulsion and a final layer of fine aggregate. Sixty sections were placed in three districts in 1986-88, totaling approximately 400 lane-km of surfacing. These sections were evaluated periodically by a team of local operations personnel and research staff. The operations personnel also provided estimates of service life for conventional single chip seals, used for a cost-benefit analysis. The modified seals performed better and were more cost-effective than conventional surface treatments. Also, the hazard of broken windshields caused by loose aggregate was virtually eliminated on the modified seal treatments. The report includes recommendations for ensuring that the final product is of high quality. The recommendations include using a pilot vehicle, limiting the speed of construction traffic, using clean dry blot aggregate, applying the coarse aggregate not more than one stone thick, and using the proper nozzles on the asphalt distributor.

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• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/19386
• Corporate Authors:

  Virginia Transportation Research Council

  530 Edgemont Road
  Charlottesville, VA  United States  22903

  Virginia Department of Transportation

  1401 East Broad Street
  Richmond, VA  United States  23219

  University of Virginia, Charlottesville

  Center for Transportation Studies, P.O. Box 400742
  Charlottesville, VA  United States  22904-4742
• Authors:
  • Maupin Jr, G W
  • Payne, C W
• Publication Date: 1995-5

Language

• English

Media Info

• Features: Appendices; Photos; References; Tables;
• Pagination: 32 p.

Subject/Index Terms

• TRT Terms: Alternatives analysis; Asphalt emulsions; Chip seals; Coarse aggregates; Construction equipment; Construction management; Cost effectiveness; Fine aggregates; Recommendations; Service life; Surface treating; Test sections
• Uncontrolled Terms: Surface treatments
• Old TRIS Terms: Modified chip seal
• Subject Areas: Construction; Design; Highways; Pavements; Research; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00681930
• Record Type: Publication
• Report/Paper Numbers: VTRC 95-R23, Project No. 9218-030
• Files: NTL, TRIS, STATEDOT
• Created Date: Jul 20 1995 12:00AM