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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.

Title:

Determining Elastic Moduli of Materials in Pavement Systems by Surface Deflection Data: A Feasibility Study

Authors:

Carpenter, William A.

Vaswami, Nari K.

H. Celik Ozyildirim

Year:	1975

VTRC No.:	76-R10
Abstract:	The determination of the elastic, or Young's, modulus, E, of the materials in each layer in an n-layered pavement system given the number, order, thicknesses, and Poisson's ratios of the layers, and the surface load and deflection data, is not possible using the classical theory of elasticity alone. This report develops some assumptions and techniques, based on the effective modulus concept, Burmister's deflection equation, the finite element method, and the concepts of beams and plates on elastic foundations, which yield mathematical solutions for such moduli.