Validation of Backcalculated Modulus Values from Falling Weight Deflectometer Through Instrumentation on I-35 in Oklahoma

Several state departments of transportation evaluate the modulus of pavement layers from nondestructive deflection tests such as the falling weight deflectometer (FWD). Although the FWD is a widely used nondestructive testing device, it still does not fully represent the loading conditions generated by moving vehicular traffic. Therefore, the modulus values backcalculated from FWD data may be different from those values backcalculated from vehicular traffic loading data. A comparison is presented of modulus values backcalculated from FWD and strain gauge measurements collected on a 1,000-ft-long instrumented section of I-35 in central Oklahoma. The FWD data were captured at different temperatures with different loading configurations. Meanwhile, longitudinal and transverse strain data were captured from May 30, 2008, through October 28, 2009, over a wide range of middepth pavement temperatures (40°F to 110°F) under actual vehicular traffic loading. The influence of different backcalculated modulus values is demonstrated through the prediction of remaining life in terms of number of equivalent single-axle loads of the existing pavement. Also presented is a description of the testing program, data collection efforts, and subsequent analysis for the I-35 instrumented section. Overall, modulus values backcalculated from the FWD and from longitudinal strain gauges showed close agreement at temperatures above 50°F.

• Record URL:
  https://doi.org/10.3141/2227-09
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=Validation+of+Backcalculated+Modulus+Values+from+Falling+Weight+Deflectometer+Through+Instrumentation+on+I-35+in+Oklahoma&author=P.+Solanki&author=M.+Zaman&author=K.+Muraleetharan&publication_year=2011
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Blurbs/166429.aspx
• Authors:
  • Solanki, Pranshoo
  • Zaman, Musharraf M
  • Muraleetharan, Kanthasamy K.
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References;
• Pagination: pp 79-86
• Monograph Title: Pavement Management 2011, Volume 3
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2227
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Backcalculation; Equivalent single axle loads; Falling weight deflectometers; Modulus of elasticity; Service life; Strain gages; Temperature
• Identifier Terms: Interstate 35
• Geographic Terms: Oklahoma
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 01333315
• Record Type: Publication
• ISBN: 9780309167505
• Report/Paper Numbers: 11-3115
• Files: TRIS, TRB, ATRI
• Created Date: Mar 21 2011 2:13PM