United States Department of Transportation
i
Development of Asphalt Dynamic Modulus Master Curve Using Falling Weight Deflectometer Measurements: Tech Transfer Summary
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2014-06-01
[PDF-710.39 KB]
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Abstract:The new American Association of State Highway and Transportation Officials (AASHTO) Mechanistic-Empirical Pavement Design Guide (MEPDG) and the associated software (AASHTOWare Pavement ME Design, formerly known as DARWin ME) represents a major advancement in pavement design and analysis. The MEPDG employs master curves based on time-temperature superposition principles to characterize the viscoelastoplastic properties of asphalt concrete (AC) materials. The MEPDG recommends the use of AC dynamic modulus, |E*|, as the design parameter. The standard laboratory procedure for AC dynamic modulus testing requires time and considerable resources. Problem Statement In the MEPDG and Pavement ME Design flexible pavement rehabilitation analysis, the pre-overlay-damaged master curve of the existing AC layer is determined by first calculating an “undamaged” modulus and then adjusting this modulus for damage using the pre-overlay condition. If the damaged AC |E*| master curve of an in-service pavement can be derived from the time histories of routinely collected falling weight deflectometer (FWD) deflection data, it would not only save lab time and resources, but it could also lead to a more accurate prediction of the pavement’s remaining service life. Objective The objective of this feasibility study was to develop frameworks for predicting AC relaxation modulus (E(t)) or |E*| master curves from routinely collected FWD time history data. According to the theory of viscoelasticity, if AC E(t) is known, |E*| can be calculated (and vice versa) through numerical interconversion procedures.
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