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dc.contributor.advisorOrton, Saraheng
dc.contributor.authorStone, Damieneng
dc.date.issued2018eng
dc.date.submitted2018 Falleng
dc.description.abstractThis research investigates the use of ultrasonic waves to evaluate the stress and damage in concrete. Tests were conducted on 6 in. x 6 in. x 12 in. plain concrete specimens (f'c = 6,000psi) at different loading stages that include 20, 40, 60, and 80% of the concrete compressive strength. Unloading at each stage was also recorded to evaluate the damage in the concrete structure. Use of higher amplitude waves were used to trigger nonlinear ultrasonic behavior. Various voltage amplitudes were used in this research at various loading stages, which included 200, 400, and 900V. The data showed a difference in wave velocity (time of flight), amplitudes, and frequency components. The time of flight (TOF) increased in a linear fashion with increased damage (previous load level). However, load on the specimen (at low level of load) decreased the time of flight readings. The amplitudes of higher frequency harmonics of waveforms decreased with damage and load level. However, both the slope of the TOFs and harmonic amplitudes with load level were not the same for the specimens tested making determination of a constant to evaluate stress in concrete difficult.eng
dc.description.bibrefIncludes bibliographical referenceseng
dc.format.extentxi, 80 pages : illustrationeng
dc.identifier.urihttps://hdl.handle.net/10355/67938
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcommunityUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.rightsOpenAccess.eng
dc.rights.licenseThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
dc.titleEvaluation of stress in concrete using ultrasonic waveseng
dc.typeThesiseng
thesis.degree.disciplineCivil engineering (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


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