Pavement Subgrade Performance Study

  • Ullidtz, Per (Project Manager)
  • Sjølin, Finn Ole (Project Participant)
  • Zhang, Wei (Project Participant)

    Project Details

    Description

    The main purpose of this project is to develop improved subgrade criteria for use in pavement design. The first test in the Danish Road Testing Machine (RTM1) which was completed in August 1996, had the additional purpose of testing different types of and placements of instruments for measuring stresses, strains, temperatures and moisture content.
    Models for prediction of permanent strain, surface rutting and roughness from measured resilient strains were developed from the first test, which also showed that linear elastic theory could not be used to predict the resilient strains in the subgrade.
    The second test pavement in the Danish Road Testing Machine was constructed in 1997, and received 150000 load applications and two frost/thaw periods. In 1999, with 17 mm of rut depth, the pavement was overlaid by 35 mm of opengraded asphalt concrete, and the loading was continued.
    The models for prediction of permanent strain, surface rutting and roughness from measured resilient strains, developed from the first test, have been modified based on the results of the second and third tests. A method for predicting the pavement response (stresses and strains) from Falling Weight Deflectometer (FWD) tests has been developed. In 1999 the project was supported by 530,000 DKK from the Road Directorate, who also contributed the equivalent of two man-years.
    StatusActive
    Effective start/end date01/02/1995 → …

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