QUARTERLY DESIGN MEETING SEPTEMBER 28 2010 Parks Highway

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. 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)

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.

Falling Weight Deflectometer

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.

Thermistors Locations

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 Full with stabilization (foam or cement) reconstruct

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

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

PMS Website Features

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