T1 - Backcalculation of asphalt-overlaid concrete pavements The methods were critically reviewed and compared for accuracy of the results.", Two types of comparisons were conducted - backcalculation using theoretically generated deflection basins and backcalculation using field-collected FWD data. The discussion of these models will be followed by a brief description and comparison of five backcalculation procedures. These procedures are based on three pavement models. This paper presents an evaluation of different procedures proposed recently for AC/PCC pavement backcalculation. There does not exist a widely accepted procedure for the backcalculation of asphalt-overlaid concrete (AC/PCC) pavements resting on a dense liquid foundation. Plate theory solutions for a slab on a dense liquid (Winkler) foundation are used for PCC pavements. Backcalculation programs based on elastic layer theory are used for AC pavements. 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). The methods were critically reviewed and compared for accuracy of the results.Ībstract = "To evaluate the structural capacity of any in-place pavement, certain information is required, including knowledge of the strength properties of each pavement layer. To evaluate the structural capacity of any in-place pavement, certain information is required, including knowledge of the strength properties of each pavement layer.
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