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Title: Backcalculation of composite pavement layer moduli
Authors: University of Kentucky. Department of Civil Engineering.
Anderson, Mark.
Keywords: Pavements
Composite pavements
Nondestructive testing
Mathematical models
Computer programs
COMDEF (computer program)
Dynamic theory
Falling weight deflectometer
Road rater
Pavement tests
Pavement evaluation
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-90-15.
Description: Technical Report
Abstract: A backcalculation program called COMDEF has been written that utilizes a new database technique to speed program execution. Like most backcalculation algorithms, COMDEF compares measured deflections with theoretical solutions. However, the COMDEF approach is to apply interpolating functions to a database of precalculated solutions, so that the comparison basins are calculated quickly with reasonable accuracy. The state of the art of nondestructive testing of pavements is reviewed and problems In evaluating composite pavements are discussed. A sensitivity study is presented which includes solutions using COMDEF and a general purpose backcalculation program. COMDEF consistently outperformed the general purpose program in both speed and accuracy. Agreement between laboratory modulus tests on field specimens and backcalculated moduli from COMDEF was reasonable. A version of COMDEF using a quasistatic response model is presented and the limitations of this method are discussed. Dynamic theory is presented as a more realistic way to predict structural responses. A version of COMDEF which uses a dynamic response model is presented that clearly shows the importance of dynamic theory in the analysis of nondestructive test data. NOTE: This file is very large. Please allow your browser several minutes to download the file.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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