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A Standardized Procedure for Analysis of The Dynamic Modulus (|E*|) Data to Predict Asphalt Pavement Distresses
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2002-01-01
[PDF-1.04 MB]
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Abstract:The present work provides a standardized procedure by which various asphalt concrete mixtures can be compared and their expected performance can be assessed in a uniform manner using the simple performance test suggested under the National Co -operative Highway Research Program NCHRP 9 -19 – Superpave Support and Performance Models Management program. The frequency sweep data generated from the test are available in terms of dynamic modulus |E*| versus frequency at the measurement temperature under different levels of confining stress (0, 20, 30 psi or 0, 2.9, 4.35 mPa). The moduli versus frequency data at different temperatures are unified to form a single curve for each mixture through a normalizing parameter. The temperature at which the normalizing parameter becomes equal to one is designated the specification parameter TS (°C) for assessing mixture performance. Each unified curve is fitted with a constitutive equation from which model parameters are evaluated. The slope B1 in the low frequency region of the unified curve, when normalized with the term (T/ TS), results in a parameter that is related to asphalt pavement distress at high temperature T. It is shown that B1/ TS is related to rut depths measured at different WesTrack, a full -scale test track, sections and the correlation improves with increasing confining stress. There is a good possibility that the slope B2 in the high frequency region of the unified curve may relate to distresses in the intermediate temperature range, such as fatigue cracking. A preliminary check shows that this might be true, but data is too limited to draw firm conclusions.
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