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Environmental Impacts on Pavement Foundation Layers

This workshop focuses on the environmental effects on the performance of pavement foundation layers. The research team from Iowa State University will present their objectives, research plan, and future expectations. Topics include the characterization of geomaterials, stiffness and resilient modulus, permanent deformation, shear strength, freeze-thaw durability, moisture susceptibility, and drainage. Field data collection and modeling analyses will be conducted to gather information on FWD, frost heave-thaw settlement, temperature, moisture, and climate data. The workshop will conclude with the presentation of the draft/final report.

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Environmental Impacts on Pavement Foundation Layers

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  1. 2019 Pavement WorkshopMay 21-23, 2019 Environmental Impacts on the Performance of Pavement Foundation Layers Bora Cetin Assistant Professor Iowa State University + 46 Associate Members

  2. RESEARCH TEAM Iowa State University • Principal Investigator – Bora Cetin Assistant Professor – Department of Civil, Construction & Environmental Engineering • Research Personnel – Patrick Bollinger PhD Student – Department of Civil, Construction & Environmental Engineering GeoEngineering Consulting, LLC • Co-Principal Investigator – Tuncer B. Edil President and Chief Engineer

  3. OUTLINE Introduction Research motivation Objectives Research plan Future expectations

  4. INTRODUCTION HMA/PCC/Granular Subgrade Base Course

  5. INTRODUCTION Six climatic regions in the United States for pavement design

  6. INTRODUCTION

  7. INTRODUCTION • Characterization of Geomaterials • Stiffness/Resilient modulus • Permanent deformation • Shear strength • Freeze-thaw durability • Moisture susceptibility • Drainage

  8. OBJECTIVES

  9. RESEARCH PLAN Task 1– Initial memorandum on expected research benefits and potential implementation steps Task 2 – Field data collection Task 3 – Modelling analyses Task 4– Draft/final report

  10. Task 2-Field Data Collection The following data will be collected • FWD • Frost heave-thaw settlement • Temperature • Moisture • Matric suction • Climate data • Air temperature, wind speed, solar radiation, relative humidity, and precipitation

  11. Task 2-Field Data Collection FWD elastic modulus of RCA base layer during 7 years (Data collected from MnDOT 2008 project).

  12. Task 2-Field Data Collection

  13. Task 3-Modelling Analyses • Multi-physics Modelling • Pavement parameters • Soil parameters • Climate data • Software • SHAW • COMSOL • PLAXIS • TEMP/W

  14. Expected Research Results TC = Thermocouple, EC = Moisture probe, PG = Dynamic pressure cell, GP = Geophone, LE = Longitudinal dynamic strain gauge, TE = Transverse dynamic strain gauge Current Sensor Installation at MnDOT

  15. Expected Research Results Proposed Sensor Installation at MnDOT

  16. Task 4-Draft/Final Report

  17. SCHEDULE

  18. Thank You

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