Chip Seal for Uniform Usages Across the Districts of NMDOT

Details

• Creators:
  Vargas-Nordcbeck, Adriana ; Chen, Chen ; Earls, Brooke ; Mann, Jeffrey
• Corporate Creators:
  Auburn University. National Center for Asphalt Technology
• Corporate Contributors:
  New Mexico. Department of Transportation
• Subject/TRT Terms:
  Chip Seals Data Collection Design Methods Field Performance Guidelines Laboratory Tests Pavement Management Systems Pavement Performance Pavement Preservation Performance Preservation

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• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; New Mexico
• Edition:
  Final Report: 2023 - 2025
• Corporate Publisher:
  New Mexico. Department of Transportation
• Abstract:
  Chip seals are a cost-effective pavement preservation treatment widely used by the New Mexico Department of Transportation (NMDOT) to extend pavement life and improve surface performance. Despite their extensive application, NMDOT has not previously adopted a standardized design procedure or construction specification, resulting in variability across districts. This research reviewed current practices, analyzed performance trends using Pavement Management System (PMS) data, and developed a formal design methodology tailored to New Mexico’s conditions. The Modified Kearby method, documented in AASHTO R 102-22, was selected as the most suitable design approach based on its practicality and compatibility with available resources. Laboratory testing of 13 aggregate sources, including reclaimed asphalt pavement (RAP), revealed significant variability in material properties and application rates, confirming the need for project-specific design. Validation through two field projects demonstrated strong agreement between laboratory-designed and field-applied rates, supporting adoption of the method. PMS analysis showed that chip seals generally perform well, with minimal bleeding and acceptable aggregate retention. Service lives average six to eight years, consistent with current practice. The study recommends adopting the Modified Kearby method, implementing statewide specifications, integrating PMS data into project selection, and constructing pilot test sections in each district during initial implementation. These measures will improve consistency, optimize material usage, and enhance long-term performance of chip seal treatments across New Mexico.
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0047ac37bb51d1eec28e12e1bf0bb06aa5976f9410d622640d8ab412c3fb033b1d538d70b8051cd5da4d71e0b5e228d9c54bf4e08108568a75eebd984052ea04
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/92351/dot_92351_DS1.pdf
• File Type:
  [PDF - 5.56 MB ]