Characterization of aggregate resistance to degradation in stone matrix asphalt mixtures

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Title: Characterization of aggregate resistance to degradation in stone matrix asphalt mixtures
Author: Gatchalian, Dennis
Abstract: Stone matrix asphalt (SMA ) mixtures rely on stone -on -stone contacts among particles to resist applied forces and permanent deformation . Aggregates in SMA should resist degradation (fracture and abrasion ) under high stresses at the contact points . This study utilizes conventional techniques as well as advanced imaging techniques to evaluate aggregate characteristics and their resistance to degradation . Aggregates from different sources and types with various shape characteristics were used in this study . The Micro -Deval test was used to measure aggregate resistance to abrasion . The aggregate imaging system (AIMS ) was then used to examine the changes in aggregate characteristics caused by abrasion forces in the Micro -Deval . The resistance of aggregates to degradation in SMA was evaluated through the analysis of aggregate gradation before and after compaction using conventional mechanical sieve analysis and nondestructive X -ray computed tomography (CT ) . The findings of this study led to the development of an approach for the evaluation of aggregate resistance to degradation in SMA . This approach measures aggregate degradation in terms of abrasion , breakage , and loss of texture .
URI: http : / /hdl .handle .net /1969 .1 /3342
Date: 2006-04-12

Citation

Characterization of aggregate resistance to degradation in stone matrix asphalt mixtures. Available electronically from http : / /hdl .handle .net /1969 .1 /3342 .

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