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Characterization and modeling of long-term behavior of frp-to-concrete interface in aggressive environments

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dc.contributorFridley, Kenneth J.
dc.contributorBarkey, Mark E.
dc.contributorRichardson, James A.
dc.contributorAaleti, Sriram
dc.contributor.advisorWang, Jialai
dc.contributor.authorAmidi, Shahrooz
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2017-03-01T17:38:06Z
dc.date.available2017-03-01T17:38:06Z
dc.date.issued2015
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractFiber reinforced plastics (FRP) composites have emerged as one the foremost structural materials in retrofit/rehabilitation of concrete structural members in last decades. The long-term durability of the FRP-to-concrete interface in aggressive environments places a critical role in the success of this technique. A comprehensive program using both the analytical and experimental approaches has been carried out in this study to examine the integrity and long-term durability of the FRP-to-concrete interface in presence of aggressive environments. Novel analytical solutions based on three-parameter elastic/viscoelastic foundation models have been developed for adhesively bonded joints first in this study to gain better understanding of stress transfer through FRP-to-concrete interface. These models overcome drawbacks in existing models by satisfying all boundary conditions and producing different peel stress distributions along two adhesive-adherend interfaces, making it possible to accurately predict the location of debonding initiation. These models have been verified with finite element analysis and experimental observations. Comprehensive experimental programs have been carried out to evaluate the deterioration of the FRP-to-concrete induced by moisture. In the first part, a novel environment-assisted subcritical debonding method using a wedge driving test has been proposed to examine the synergistic effect of the mechanical loads and environmental conditions on the deterioration of the FRP-to concrete interface. The deterioration of the interface induced by water has also been evaluated through measuring the residual fracture toughness of the FRP-to-concrete interface conditioned in water through two different ways. It has been found that conditioning method can have significant effect on the testing results. A novel wedge-split test has been proposed and carried out to directly measure the traction-separation law of the epoxy-concrete interfaces under mode I loading, which is not available in the literature. The potential of using silane coupling agent to improve the durability of the FRP-to-concrete interface has also been examined in the experimental program. Testing results confirm that the residual fracture toughness of the FRP-to-concrete interface attacked by moisture can be significantly increased by silane treatment.en_US
dc.format.extent265 p.
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otheru0015_0000001_0002143
dc.identifier.otherAmidi_alatus_0004D_12593
dc.identifier.urihttps://ir.ua.edu/handle/123456789/2520
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectCivil engineering
dc.titleCharacterization and modeling of long-term behavior of frp-to-concrete interface in aggressive environmentsen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Civil, Construction, and Environmental Engineering
etdms.degree.disciplineCivil, Construction & Environmental Engineering
etdms.degree.grantorThe University of Alabama
etdms.degree.leveldoctoral
etdms.degree.namePh.D.

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