ABSTRACT KESHAVARZI, BEHROOZ. Prediction of Thermal Cracking in Asphalt Pavements Using Simplified Viscoelastic Continuum Damage (S-VECD) Theory. (Under the direction of Dr. Y. Richard Kim). Thermal cracking, which is usually manifested as a series of parallel, surface-initiated cracks, is one of the major types of distress in asphalt concrete pavements built in cold regions where air temperature shows a significant drop. Propagation of thermal cracks in asphalt layers will eventually allow water to come into the pavement system and causes deterioration of pavement structure which in turn reduces its serviceability. In addition, asphalt pavement sections constructed in warmer regions experience significant daily temperature variation and tolerate thermal cracks. The Asphalt concrete is a viscoelastic material which its response depends on loading rate and temperature. ANY failure criterion should be able to consider loading rate and temperature into consideration. Simplified viscoelastic continuum damage (S-VECD) is a continuum damage approach that is able to model macrocrack evolution with parameters that are measurable at the macroscale level. In this study, to characterize the material behavior in monotonic loading, uniaxial direct tension monotonic test is performed on asphalt mixtures that have different percent of reclaimed asphalt pavement (RAP) content. It is shown that the measured evolution of stress during the test up to strength value can be predicted using S-VECD model that is characterized by the Asphalt Mixture Performance Tester (AMPT) dynamic modulus and cyclic fatigue tests. The coefficient of thermal contraction (CTC) transfers temperature drop to the thermal strain. This research performs a comprehensive review on the suggested procedure for measuring
Prediction of Thermal Cracking in Asphalt Pavements Using Simplified Viscoelastic Continuum Damage
Jul 01, 2023
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