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A linear-elastic computer program is used to model uniform and annular loading distributions beneath the area of loading. Load distributions were selected to approximate those obtained using conventional impulse loading equipment on a variety of in-service asphalt pavement surfaces. Maximum surface deflections are computed for a factorial of pavement structures using the ELSYM5 computer program. The maximum deflections calculated under uniform load distributions are used to develop regression equations for the prediction of the asphalt layer modulus for twenty four separate pavement families. These equations are used in conjunction with deflections calculated under annular load distributions to backcalculate asphalt moduli. The errors which are introduced in asphalt layer moduli prediction due to various annular loading conditions are presented.
falling weight deflectometer, load distributions, annular loading, backcalculation, asphalt layer moduli
Vice President, ERES International, Inc.Marquette University, SavoyMilwaukee, ILWI
Research Engineer, USA-CERL, Champaign, IL