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dc.contributor.advisorWasher, Glenn A.eng
dc.contributor.authorBolleni, Naveen Kumar, 1985-eng
dc.date.issued2009eng
dc.date.submitted2009 Falleng
dc.descriptionThe entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.eng
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on December 21, 2009)eng
dc.descriptionThesis advisor: Dr. Glenn Washer.eng
dc.descriptionM.S. University of Missouri--Columbia 2009.eng
dc.description.abstractDeterioration of concrete due to corrosion of embedded steel reinforcing bars and prestressing strands represent a significant challenge for inspection and maintenance engineers. Cracking, delaminations and spalling that can occur as a result of corrosion of embedded reinforcing steel accelerate bridge deterioration and lead to pot holes and even punch-through of concrete bridge decks. The typical method for detecting delaminations is hammer sounding, which requires hands-on access to the material under inspection. Specialized equipment and lane closures are frequently necessary to achieve the required access. The application of infrared thermography to detect subsurface damage in concrete has the potential to image delaminations from a distance, such that direct access to the surface of the concrete is not required. Thermographic imaging relies on certain environmental conditions to create thermal gradients in the concrete such that subsurface features can be detected. This thesis presents the results of an investigation to determine necessary environmental conditions for the detection of subsurface damage in concrete. To evaluate environmental effects, a large concrete test block has been constructed. Embedded targets in the test block were used to model delaminations in concrete. Environmental factors including wind speed, relative humidity, solar loading and variations in the ambient temperature have been measured by a weather station located on-site with the block. The effects of these environmental factors have been examined to determine their impact on the detectability of the subsurface targets. Characteristics of optimum inspection conditions for utilizing infrared thermography in the field are discussed.eng
dc.description.bibrefIncludes bibliographical references.eng
dc.identifier.oclc491403460eng
dc.identifier.urihttps://doi.org/10.32469/10355/5374eng
dc.identifier.urihttps://hdl.handle.net/10355/5374
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2009 Theseseng
dc.rightsOpenAccess.eng
dc.rights.licenseThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
dc.subject.lcshConcrete bridges -- Maintenance and repaireng
dc.subject.lcshConcrete bridges -- Thermal properties -- Testing -- Remote sensingeng
dc.subject.lcshConcrete -- Deteriorationeng
dc.subject.lcshConcrete -- Corrosioneng
dc.titleEnvironmental effects on subsurface defect detection in concrete structures using infrared thermographyeng
dc.typeThesiseng
thesis.degree.disciplineCivil and Environmental Engineering (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


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