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Mid-America Transportation Center

NDOR Layer Moduli of Nebraska Pavements for the New Mechanistic-Empirical Pavement Design Guide

Final Report
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Researchers

  • Principal Investigator: Yong Rak Kim (ykim3@unl.edu (402)472-1727)
  • Project Status
    Complete
    Sponsors & Partners
  • Nebraska Department of Roads
  • About this Project
    Brief Project Description & Background
    The primary objective of this research is to develop a database of dynamic (and resilient) modulus values of various materials used in Nebraska using the UTM-25kN testing facilities for the New Mechanistic-Empirical Pavement Design Guide (MEPDG). In addition to the direct laboratory testing of the representative Nebraska pavement materials for Level 1 design inputs, surrogate methods such as the use of Witczak's predictive equations and the use of default resilient moduli based on Nebraska soil classification data (Level 2 and /or Level 3 design inputs) will be evaluated to investigate their applicability for the design of pavements that are normally subject to low traffic volume.
    Research Objective
    The primary objective of this research is to develop a database of dynamic (and resilient) modulus values of various materials used in Nebraska using the UTM-25kN testing facilities.
    Potential Benefits
    The experience and database obtained from this research will help the Nebraska Department of Roads (NDOR) Materials, Pavement and Maintenance (MPM) Unit implement the moduli testing in its laboratory.
    Abstract
    As a step-wise implementation effort of the Mechanistic-Empirical Pavement Design Guide (MEPDG) for the design and analysis of Nebraska flexible pavement systems, this research develops a database of layer moduli — dynamic modulus, creep compliance, and resilient modulus — of various pavement materials used in Nebraska. The database includes all three design input levels. Direct laboratory tests of the representative Nebraska pavement materials are conducted for Level 1 design inputs, and surrogate methods, such as the use of Witczak’s predictive equations and the use of default resilient moduli based on soil classification data, are evaluated to include Level 2 and/or Level 3 design inputs. Test results and layer modulus values are summarized in Appendices. Modulus values characterized for each design level are then input into the MEPDG software to investigate level-dependent performance sensitivity of typical asphalt pavements. The MEPDG performance simulation results then reveal any insights into the applicability of different modulus input levels for the design of typical Nebraska pavements. Significant results and findings are presented in this report.
    Project Amount
    $ 255,367