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Quarterly Design Meeting September 28, 2010

Quarterly Design Meeting September 28, 2010. Parks Highway Data and Website Update Pavement Management/Preservation Engineer Jim Horn, P.E. Parks Hwy: What Was Needed. Remove weight restrictions placed on Parks Hwy during Spring breakup.

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Quarterly Design Meeting September 28, 2010

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  1. Quarterly Design MeetingSeptember 28, 2010 Parks Highway Data and Website Update Pavement Management/Preservation Engineer Jim Horn, P.E.

  2. Parks Hwy: What Was Needed • Remove weight restrictions placed on Parks Hwy during Spring breakup. • Many projects completed in the past to correct some areas. Where are we now? • Needed an evaluation on conditions and recommendations for eliminating future weight restrictions • Need more than a surface evaluation; Need the Falling Weight Deflectometer (FWD)

  3. FWD: How Does It Work? • The FWD applies a dynamic load to the pavement to simulate the magnitude and duration of a single moving wheel load. • The vertical deflection at various distances are measured by geophone sensors. • The measurements are analyzed by a process called backcalculation: • Complex iterative process which calculates the modulus of each pavement structural layer.

  4. Falling Weight Deflectometer

  5. Frost Correlation • Parks Highway has thermistors located at many sites between Wasilla and Fairbanks. • Thumping began at these sites prior to breakup and continued until thaw depth was 4+ feet. • This will provide a correlation between temperature, depth of thaw and modulus of the materials in the structure.

  6. Thermistors Locations

  7. Results • Backcalculations will illustrate strength throughout the structural layers. • Possible actions based on the analysis: • Do nothing structurally - maybe Mill & Fill if needed • Overlay • Reclaim with stabilization (foam or cement) • Full reconstruct

  8. Other Data • Compiled Data over past 12 years • Rut depth • IRI (smoothness) • Available in Excel spreadsheet • Put on L:\Engineering\Pavement Management • Once FWD Data is available it will be made available

  9. Updated Website • http://www.dot.state.ak.us/stwdmno/pvmtmgt/index.shtml • Still uploading Aviation reports. • Have not completed Highway Data analysis / upload yet.

  10. PMS Website Features

  11. Jim Horn 269-6237 Jim.horn@alaska.gov New and Improved Website at: http://www.dot.state.ak.us/stwdmno/pvmtmgt/index. shtml

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