Measurement and effects of segregated hot mix asphalt pavement
Abstract
Asphalt mixture segregation is the nonuniform distribution of coarse and fine aggregate components. Because of segregation, early distress of asphalt pavement results. A test that identifies asphalt mixture segregation would be a significant contribution to asphalt technology. There are several factors that lead to segregation. Segregation can occur during stockpiling and handling of aggregate, and during mixing, storage, transport, and laydown of the asphalt mixture. Sometimes segregation may result from a single source or from a combination of sources. Nondestructive test methods have been examined to determine their effectiveness in detecting segregation. These methods included thermal imaging, air permeability, nuclear moisture (asphalt) and density, and permittivity. Based on the effectiveness of these technologies in a laboratory environment, the standard moisture/density nuclear gauge technology was field tested with a high degree of success. Asphalt mixture segregation results in distresses such as raveling, stripping, rutting and cracking developing prematurely. Relative performance of mixtures with varying levels of segregation were determined through repeated flexural fatigue and accelerated wheel track testing. Recommendations for future research from this study are outlined.
Degree
Ph.D.
Advisors
White, Purdue University.
Subject Area
Civil engineering|Materials science|Petroleum production
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