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MECHANISTIC ANALYSIS AND ECONOMIC BENEFITS OF FIBER-REINFORCED ASPHALT MIXTURES

By: Tripathi, Ashish [author].
Material type: TextTextPublisher: Scholar Works at UT Tyler, 2018-04-23T07:00:00ZContent type: text Media type: computer Carrier type: online resourceSubject(s): Fiber | Mechanistic analysis | Fatigue cracking | Rutting | Tensile strain | Displacement | Fatigue life | Rutting life | Cost-effectiveness | Civil EngineeringOnline resources: Thesis Click here to view this thesis. Summary: Fatigue cracking and permanent deformation (rutting) are major distresses that occur in flexible pavements. Four-point bending beam as well as flow number laboratory tests have been used for several decades to evaluate the long-term fatigue and rutting resistance for asphalt mixture, respectively. One of the most significant solutions to prolong the fatigue life and improve rutting resistance for an asphaltic mixture is to utilize flexible materials such as fibers. In 2008 a laboratory testing program was performed on a conventional and fiber-reinforced mixtures to investigate the impact of added fibers on the mechanical, mechanistic, and economical attributes of asphaltic mixtures. Strain controlled fatigue tests were also conducted in that testing program according to American Association of State Highway and Transportation Officials (AASHTO) procedures. The results from the beam fatigue tests indicated that the fiber-reinforced mixtures would have much longer fatigue and rutting resistance life compared with the reference (conventional) mixtures. Additionally, a mechanistic analysis using 3D-Move software coupled with a cost-effectiveness analysis study based on the fatigue and rutting resistance performance on the two mixtures was performed for both newly constructed and overlay pavement structures. Overall, the analysis showed that fiber-reinforced asphalt mixtures exhibited significantly lower cost of pavement per 1000 cycles of fatigue and rutting lives per mile compared to conventional HMA mixture.
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Item type Current location Collection Call number URL Status Date due Barcode
UT Tyler Thesis UT Tyler Online
Online
University Archives & Special Collections TA455.A7 .T75 2018 (Browse shelf) http://hdl.handle.net/10950/827 Available 1046657773

Fatigue cracking and permanent deformation (rutting) are major distresses that occur in flexible pavements. Four-point bending beam as well as flow number laboratory tests have been used for several decades to evaluate the long-term fatigue and rutting resistance for asphalt mixture, respectively. One of the most significant solutions to prolong the fatigue life and improve rutting resistance for an asphaltic mixture is to utilize flexible materials such as fibers. In 2008 a laboratory testing program was performed on a conventional and fiber-reinforced mixtures to investigate the impact of added fibers on the mechanical, mechanistic, and economical attributes of asphaltic mixtures. Strain controlled fatigue tests were also conducted in that testing program according to American Association of State Highway and Transportation Officials (AASHTO) procedures. The results from the beam fatigue tests indicated that the fiber-reinforced mixtures would have much longer fatigue and rutting resistance life compared with the reference (conventional) mixtures. Additionally, a mechanistic analysis using 3D-Move software coupled with a cost-effectiveness analysis study based on the fatigue and rutting resistance performance on the two mixtures was performed for both newly constructed and overlay pavement structures. Overall, the analysis showed that fiber-reinforced asphalt mixtures exhibited significantly lower cost of pavement per 1000 cycles of fatigue and rutting lives per mile compared to conventional HMA mixture.

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