Characterization and deterioration detection of portland cement concrete using ultrasonic waves

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dc.contributor.authorAl-Akhras, Nabil M.en
dc.contributor.committeechairAl-Qadi, Imadeddin L.en
dc.contributor.committeememberDuke, John C. Jr.en
dc.contributor.committeememberWalker, Richard D.en
dc.contributor.committeememberBarker, Richard M.en
dc.contributor.committeememberCramer, Mark S.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2014-03-14T21:14:04Zen
dc.date.adate2008-06-06en
dc.date.available2014-03-14T21:14:04Zen
dc.date.issued1995-11-10en
dc.date.rdate2008-06-06en
dc.date.sdate2008-06-06en
dc.description.abstractAn experimental study was conducted to characterize Portland cement concrete (PCC), to detect deterioration induced by freeze/thaw and alkali-silica reaction, and to detect chloride presence in PCC using ultrasonic waves. The experimental program was initiated to investigate the effect of water to cement (w/c) ratio, aggregate type, and air entrainn1ent on measured ultrasonic wave velocity and signal energy. Three w/c ratios (0.35, 0.45, and 0.55) were evaluated. Two aggregate types, quartzite and limestone, were included in the PCC mixes separately. Mixes were prepared as non-air entrained and air entrained. Thus, a total of twelve batches were prepared to evaluate PCC using ultrasonic waves at two frequencies, 54 and 340 kHz. The experimental program to investigate freeze/thaw (FT) damage included the effect of curing time, w/c ratio, and aggregate type. The effect of curing time was investigated by exposing PCC specimens cured for 3 and 7 days to FT. Two w/c ratios were considered, 0.45 and 0.55. The effect of aggregate on detecting FT damage was investigated using two types of crushed stone aggregate, quartzite and limestone. Alkali-silica reaction (ASR) damage was investigated uSIng two w/c ratios, 0.35 and 0.45. Embedded composite strain gages were used to monitor the ASR deleterious deterioration. High alkali cement and active silica aggregate were used to produce ASR.en
dc.description.degreePh. D.en
dc.format.extentxiv, 187 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06062008-170019en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06062008-170019/en
dc.identifier.urihttp://hdl.handle.net/10919/38373en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1995.A435.pdfen
dc.relation.isformatofOCLC# 34353424en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectnondestructive evaluationen
dc.subject.lccLD5655.V856 1995.A435en
dc.titleCharacterization and deterioration detection of portland cement concrete using ultrasonic wavesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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