Designing fine aggregate mixtures to evaluate fatigue crack-growth in asphalt mixtures.
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2011-04-01
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Abstract:Fatigue cracking is a significant form of pavement distress in flexible pavements. The properties of the
sand-asphalt mortars or fine aggregate matrix (FAM) can be used to characterize the evolution of fatigue
crack growth and self-healing in asphalt mixtures. This study compares the internal microstructure of the
mortar within a full asphalt mixture to the internal microstructure of the FAM specimen. This study also
conducts a limited evaluation of the influence of mixture properties and methods of compaction on the
engineering properties of the FAM specimens. The results from this study, although limited in number,
indicate that in most cases the SGC compacted FAM specimen had a microstructure that most closely
resembled the microstructure of the mortar within a full asphalt mixture. Another finding from this study
was that, at a given level of damage, the healing characteristic of the three different types of FAM mixes
was not significantly different. This indicates that the healing rate is mostly dictated by the type of binder
and not significantly influenced by the gradation or binder content, as long as the volumetric distribution
of the mastic was the same. In other words, the inherent healing characteristics of the asphalt binder plays
a more significant role relative to other properties (e.g. volumetrics) in the overall fatigue
cracking resistance of the asphalt mixture.
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