Evaluation of HWD Backcalculation Tools and Methodologies Using FAA National Airport Pavement Test Facility’s Data

Accurate estimation of the elastic modulus of pavement layers is essential when examining the condition and load bearing capacity of an airfield pavement. Pavement surface deflections obtained from heavy weight deflectometer (HWD) have been widely used as a non-destructive testing method to obtain the elastic modulus of the pavement layers. The method involves a backcalculation procedure. The accuracy of the backcalculated modulus depends upon the accuracy of the forward calculation method as well as the iteration technique. This paper presents findings from implementing a number of tools and methodologies developed for HWD test analysis using data from the National Airport Pavement Test Facility’s HWD Round-up study. Selected tools for backcalculation of the test data represent a variety of methodologies from the typical multilayer elastic theory to the method of equivalent thickness and the artificial neural network. The findings presented in this study formed the basis of the recommendation for improving and upgrading BAKFAA to be used more effectively as a comprehensive and state-of-the-practice airfield pavement backcalculation.

• Record URL:
  https://doi.org/10.1061/9780784480953.018
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784480953
• Supplemental Notes:
  • © 2017 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Ashtiani, A
  • Shirazi, H
  • Murrell, S
  • Speir, R
• Conference:
  • International Conference on Highway Pavements and Airfield Technology 2017
  • Location: Philadelphia Pennsylvania, United States
  • Date: 2017-8-27 to 2017-8-30
• Publication Date: 2017

Language

• English

Media Info

• Media Type: Web
• Pagination: pp 207-217
• Monograph Title: Airfield and Highway Pavements 2017: Airfield Pavement Technology and Safety

Subject/Index Terms

• TRT Terms: Airport runways; Backcalculation; Modulus of elasticity; Pavement layers
• Identifier Terms: BAKFAA (Computer program); National Airport Pavement Test Facility
• Uncontrolled Terms: Heavy weight deflectometers
• Subject Areas: Aviation; Pavements;

Filing Info

• Accession Number: 01690558
• Record Type: Publication
• ISBN: 9780784480953
• Files: TRIS, ASCE
• Created Date: Dec 31 2018 10:00PM