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dc.contributor.advisorLytton, Robert L.en_US
dc.creatorLuo, Xueen_US
dc.date.accessioned2012-07-16T15:58:07Zen_US
dc.date.accessioned2012-07-16T20:30:20Z
dc.date.available2014-09-16T07:28:20Z
dc.date.created2012-05en_US
dc.date.issued2012-07-16en_US
dc.date.submittedMay 2012en_US
dc.identifier.urihttp://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10924en_US
dc.description.abstractFatigue cracking is one of the most common distresses of asphalt pavements, whereas healing is a counter process to cracking which alleviates cracking damage and extends fatigue life of asphalt pavements. Most of existing methods to characterize fatigue cracking and healing are generally empirical or phenomenological in nature, which does not satisfy the need to develop mechanistic-based pavement design methods. The objective of this study is to characterize fatigue cracking and healing of asphalt mixtures using an energy-based mechanistic approach. A controlled-strain repeated direct tension (RDT) test is selected to generate both fatigue cracking and permanent deformation in an asphalt mixture specimen. Fatigue cracking is separated from permanent deformation from a mechanical viewpoint. The development of fatigue cracking is described by the evolution of the damage density and the increase of the average crack size with the increase of loading cycles. A creep and step-loading recovery (CSR) test is designed to measure the internal stress in the recovery phase of an asphalt mixture specimen. The internal stress and the strain measured in the recovery phase are used to conduct the mechanistic analysis of recovery and healing of the asphalt mixture specimen. Then healing is described using the decrease of the damage density and average crack size with time. Different types of asphalt mixtures produce distinctly different fatigue cracking and healing characteristics. The effect of mixture composition, temperature, and aging are evaluated using the approach above. The entire series of tests for fatigue, permanent deformation and healing can be completed in one day, with the healing part requiring only a matter of minutes. The methods proposed in this study characterize fatigue cracking and healing of asphalt mixtures using its essential cause and effect relationship.en_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.subjectasphalt mixturesen_US
dc.subjectfatigueen_US
dc.subjectcrack growthen_US
dc.subjecthealingen_US
dc.subjectrecoveryen_US
dc.subjectdissipated pseudo strain energyen_US
dc.subjectrecoverable pseudo strain energyen_US
dc.subjectdissipated strain energyen_US
dc.subjectrecoverable strain energyen_US
dc.subjectenergy-based mechanistic approachen_US
dc.subjecttrue stressen_US
dc.subjectinternal stressen_US
dc.subjectdamage densityen_US
dc.subjectaverage crack sizeen_US
dc.subjectnumber of cracksen_US
dc.titleCharacterization of Fatigue Cracking and Healing of Asphalt Mixturesen_US
dc.typeThesisen
thesis.degree.departmentCivil Engineeringen_US
thesis.degree.disciplineCivil Engineeringen_US
thesis.degree.grantorTexas A&M Universityen_US
thesis.degree.nameDoctor of Philosophyen_US
thesis.degree.levelDoctoralen_US
dc.contributor.committeeMemberLittle, Dallas N.en_US
dc.contributor.committeeMemberEpps Martin, Amyen_US
dc.contributor.committeeMemberHartwig, Karl T.en_US
dc.contributor.committeeMemberLuo, Rongen_US
dc.type.genrethesisen_US
dc.type.materialtexten_US
local.embargo.terms2014-07-16en_US


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