Graphical Methods for Determining Moduli of Pavement and Sublayers from Deflection Data

Report No: 78-R53

Published in 1978

About the report:

In this investigation a relationship between the ratio of the moduli of two layers in a two-layer pavement system and the ratio of deflections in a load deflected basin was developed. Charts correlating the relationship between these ratios are given in the report. By means of these charts, the moduli of the asphaltic concrete layers and the sublayer can be determined from dynaflect or Benkelman beam deflection data. A method of determining the moduli is outlined. This method can be used as an aid in correcting pavement deflections for changes in subgrade modulus values due to changes in subgrade moisture. The method is explained by means of examples.

Disclaimer Statement:The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.

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Nari K. Vaswani

Last updated: January 27, 2024

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