Designing Fine Aggregate Mixtures to evaluate fatigue crack growth in asphalt mixtures

Description:

"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 play a more significant role relative to other properties (e.g. volumetrics) in the overall fatigue cracking resistance of the asphalt mixture."

Creator(s):
Location(s): United States - Texas
Creation Date: April 2001
Partner(s):
UNT Libraries Government Documents Department
Collection(s):
Texas State Publications
Usage:
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Past 30 days: 7
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Creator (Author):
Creator (Author):
Creator (Author):
Publisher Info:
Publisher Info: Southwest Region University Transportation Center, Center for Transportation Research, University of Texas at Austin
Place of Publication: Austin, Texas
Date(s):
  • Creation: April 2001
Coverage:
Place
United States - Texas
Era
Into Modern Times, 1939-Present
Date
2011  
Description:

"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 play a more significant role relative to other properties (e.g. volumetrics) in the overall fatigue cracking resistance of the asphalt mixture."

Note:

"April 2011."

Includes bibliographical references (p. 37-40).

Physical Description:

xi, 42 p. : ill. ; 28 cm..

Language(s):
Subject(s):
Keyword(s): asphalt | sand-asphalt mixture | fine aggregate matrix | fatigue | self-healing
Contributor(s):
Series Title: Research report (Southwest Region University Transportation Center (U.S.))
Partner:
UNT Libraries Government Documents Department
Collection:
Texas State Publications
Identifier:
  • LOCAL-CONT-NO: txca-0099
  • OCLC: 752989090 |
  • TXDOC: Z TA505.7 R299SW NO.11/161022-1
  • REP-NO: SWUTC/11/161022-1
  • ARK: ark:/67531/metapth303481
Resource Type: Report
Format: Text