Life-Extending Benefit of Chip Sealing for Pavement Preservation

Chip seals are effective pavement preservation treatments that are usually applied to address non-fatigue cracking, weathering and raveling, seal the surface, delay oxidation and finally, improving skid resistance. This study used field performance data of test sections from the Pavement Preservation Group (PG) Study being conducted by the National Center for Asphalt Technology (NCAT) and the Minnesota DOT’s Road Research Facility (MnROAD). Data from test sections located in a low traffic volume road with a hot, wet, no-freeze climate collected over a period of seven years were used to evaluate the effect of several chip seal treatments. Treatments range from single to multilayer systems, and include different construction techniques such as rejuvenating scrub seal and fiber membrane. Also, a section was crack sealed prior to the application of a single layer chip seal to assess the benefits. A semi-parametric survival analysis was performed to determine the differences in median time to failure (MTTF) for different chip seal sections versus a controlled section – representing a “do-nothing” scenario. The results showed that the MTTF for a single layer chip seal ranges from 6.8 to 9.1 years depending on the pretreatment condition. Crack sealing prior to chip seal could extend the MTTF by an additional 1 to 3 years, depending on initial conditions. Double and triple layer chip seals extend the MTTF beyond 10 years. Finally, the scrub seal provided the highest benefits, with survival rates close to 100% after 10 years of performance.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 16p

Subject/Index Terms

Filing Info

  • Accession Number: 01763767
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-02041
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:11AM