Designing Fine Aggregate Mixtures to evaluate fatigue crack growth in asphalt mixtures Page: VI
xi, 42 p. : ill. ; 28 cm..View a full description of this report.
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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 char-
acterize 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 evalu-
ation 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. An-
other 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.vi
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Bhasin, Amit; Motamed, Arash & Izadi, Anoosha. Designing Fine Aggregate Mixtures to evaluate fatigue crack growth in asphalt mixtures, report, April 2001; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth303481/m1/8/: accessed June 6, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.