Backcalculation of asphalt-overlaid concrete pavements

Trent J. McPeak, Lev Khazanovich

Research output: Chapter in Book/Report/Conference proceedingConference contribution


To evaluate the structural capacity of any in-place pavement, certain information is required, including knowledge of the strength properties of each pavement layer. Currently, generally accepted methods exist for the backcalculation of flexible, asphalt (AC) pavement and rigid, portland cement concrete (PCC) pavement layer stiffness characteristics using data collected with a falling weight deflectometer (FWD). Backcalculation programs based on elastic layer theory are used for AC pavements. Plate theory solutions for a slab on a dense liquid (Winkler) foundation are used for PCC pavements. There does not exist a widely accepted procedure for the backcalculation of asphalt-overlaid concrete (AC/PCC) pavements resting on a dense liquid foundation. This paper presents an evaluation of different procedures proposed recently for AC/PCC pavement backcalculation. These procedures are based on three pavement models. The discussion of these models will be followed by a brief description and comparison of five backcalculation procedures. Two types of comparisons were conducted - backcalculation using theoretically generated deflection basins and backcalculation using field-collected FWD data. The methods were critically reviewed and compared for accuracy of the results.

Original languageEnglish (US)
Title of host publicationAircraft/Pavement Technology
Subtitle of host publicationIn the Midst of Change
Number of pages18
StatePublished - Dec 1 1997
EventProceedings of the 1997 Airfield Pavement Conference - Seattle, WA, USA
Duration: Aug 17 1997Aug 20 1997


OtherProceedings of the 1997 Airfield Pavement Conference
CitySeattle, WA, USA

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