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Pavement subgrade MR design values for Michigan's seasonal changes : appendices.
  • Published Date:
    2009-07-22
  • Language:
    English
Filetype[PDF-1.71 MB]


Details:
  • Publication/ Report Number:
    RC-1531
  • Resource Type:
  • Geographical Coverage:
  • OCLC Number:
    677083964
  • Edition:
    Appendices.
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Design ; NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology ;
  • Format:
  • Abstract:
    The resilient modulus (MR) of roadbed soil plays an integral role in the design of pavement systems. Currently, the various regions of the Michigan Department of Transportation (MDOT) use different procedures to determine the MR values. Most of these procedures are applicable to the new Mechanistic-Empirical Pavement Design Guide (ME PDG) level 3 design only and the 1993 AASHTO design guide. Therefore, a consistent, uniform, and implementable procedure that meets the requirements of the M-E PDG for level 1, 2, and 3 designs and the 1993 AASHTO Design Guide was developed. In this study, the State of Michigan was divided into fifteen clusters where the physical and engineering characteristics of the soils were similar. The clusters were then divided into ninety nine areas to narrow down the ranges of the engineering and physical characteristics of the soils. Disturbed roadbed soil samples were collected from seventy five areas, and twelve undisturbed soil samples (Shelby tubes) were collected from areas with CL and SC roadbed soils. The soil samples were subjected to simple tests (moisture content, grain size distribution, and Atterberg limits when applicable), and cyclic load triaxial tests to determine the soils resilient modulus values. Predictive correlation equations were developed to estimate the MR values of the roadbed soil based on the results of the simple tests. Deflection data from Falling Weight Deflectometer (FWD) tests conducted throughout the state were obtained from MDOT. The deflection database consisted of hundreds of previous FWD tests that were conducted on various projects over the last 20+ years and eighty FWD tests conducted as part of this study. All FWD data files with sufficient data were analyzed to backcalculate the roadbed soil MR values. Comparison between the laboratory and the backcalculated MR values indicated that the two values are almost equal when the stress boundaries used in the laboratory tests matched those of the FWD tests. The report includes the recommended MR design values are provided on state map and in table format.

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