Layer Coefficients for New Hampshire Department of Transportation Pavement Design

At present, New Hampshire Department of Transportation (NHDOT) has adopted AASHTO empirical pavement design approach. This research focused on updating the layer coefficients (a-value) of the asphalt mixtures using different mechanistic and performance based measures. A set of 18 commonly used mixtures in New Hampshire were selected for performance testing and evaluation of structural contribution in terms of layer coefficients. In order to develop the layer coefficients, comprehensive research was performed on the performance and properties of the mixtures through different mechanistic based laboratory testing methods. In addition, mixtures from the New England region were used to develop and validate three novel performance index parameters for rutting, fatigue and transverse cracking. The developed parameters were incorporated with the field distress data such as International Roughness Index (IRI) in order to develop mechanistically informed layer coefficients for New Hampshire flexible pavement design approach.

• Record URL:
  • https://mm.nh.gov/files/uploads/dot/remote-docs/nhdot-research-26962n-2019-report.pdf
• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/49950
• Corporate Authors:

  University of New Hampshire, Durham

  Department of Civil and Environmental Engineering
  Durham, NH  United States 

  New Hampshire Department of Transportation

  Bureau of Materials and Research
  Box 483, 5 Hazen Drive
  Concord, NH  United States  03302-0483

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Dave, Eshan V
  • Sias, Jo E
  • Nemati, Rasool
• Publication Date: 2019-6

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 163p

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Fatigue (Mechanics); Flexible pavements; Layer coefficient (Pavements); Pavement design; Rutting; Transverse cracking
• Identifier Terms: International Roughness Index; New Hampshire Department of Transportation
• Uncontrolled Terms: Performance based design
• Subject Areas: Design; Highways; Pavements;

Filing Info

• Accession Number: 01716002
• Record Type: Publication
• Report/Paper Numbers: FHWA-NH-RD-26962N
• Contract Numbers: 26962N, A004(533)
• Files: NTL, TRIS, ATRI, USDOT, STATEDOT
• Created Date: Sep 12 2019 12:41PM