Evaluation of Soil Water Characteristic Curves (SWCC) in Pavement ME for Nevada's Unbound Materials (NDOT 364-16-803)

The Nevada Department of Transportation (NDOT) has recently implemented the Mechanistic-Empirical Pavement Design Guide (MEPDG), as well as its associated AASHTOWare Pavement ME software for designing new and rehabilitated flexible pavements in Nevada. The Pavement ME conducts advanced mechanistic analysis of pavement structures, while taking into consideration traffic, climate, and material properties. Currently, NDOT has a Manual for Designing Flexible Pavements, which utilizes the AASHTOWare Pavement ME. The Pavement ME includes the effects of environmental conditions, such as precipitation and temperature, in the determination of changes in the subgrade (SG), and in the unbound material properties throughout the life of the pavement; however, the Pavement ME also requires the soilwater characteristic curve (SWCC) to estimate the degree of saturation in an unbound layer, in order to predict the resilient modulus (Mr) of the material. A comprehensive national database containing SWCC default inputs was developed as part of NCHRP 09-23A; these inputs are used by NDOT in the design of pavement sections based on MEPDG. Currently, NDOT is utilizing generic values for the prediction of the SWCC model parameters for unbound materials in base layers. NDOT desires to utilize specific values regarding unbound materials used in Nevada, so that appropriate predictions can be made for the degree of saturation in unbound layers. As a result, the intent of this research is to provide NDOT with an organized database of material gradation, as well as other engineering properties, for the most common types of subgrades, aggregate base, select borrow, and drain rock materials used in Nevada.

  • Supplemental Notes:
    • Contract to a Performing Organization has not yet been awarded.


  • English


  • Status: Completed
  • Funding: $155,079.00
  • Contract Numbers:


  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Managing Organizations:

    Nevada Department of Transportation

    1263 South Stewart Street
    Carson City, NV  United States  89712
  • Performing Organizations:

    University of Nevada, Reno

    1664 N. Virginia Street
    Reno, Nevada  United States  89557
  • Principal Investigators:

    Hajj, Elie

  • Start Date: 20160802
  • Expected Completion Date: 20180930
  • Actual Completion Date: 20180930

Subject/Index Terms

Filing Info

  • Accession Number: 01650582
  • Record Type: Research project
  • Source Agency: Nevada Department of Transportation
  • Contract Numbers: 364-16-803
  • Files: RiP, STATEDOT
  • Created Date: Nov 6 2017 2:25PM