Chemical treatment of corroding steel reinforcement after removal of chloride contaminated concrete

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dc.contributor.authorCollins, William D.en
dc.contributor.committeechairWeyers, Richard E.en
dc.contributor.committeememberGordon, Ronald S.en
dc.contributor.committeememberBrown, Jesse J. Jr.en
dc.contributor.departmentMaterials Engineeringen
dc.date.accessioned2014-03-14T21:42:58Zen
dc.date.adate2009-08-18en
dc.date.available2014-03-14T21:42:58Zen
dc.date.issued1991-06-12en
dc.date.rdate2009-08-18en
dc.date.sdate2009-08-18en
dc.description.abstractThe increasing use of deicing salts has caused the accelerated deterioration of bridge decks due to cracking and spalling from chloride induced corrosion of steel reinforcement. One method being considered as a possible corrosion abatement measure is the removal of chloride contaminated concrete and the chemical treatment of the partially exposed rebar through ponding and/or placement of chemically treated mortar. Reinforced concrete specimens were cast and subjected to repeated exposure to NaCl solution. Half-cell potential, corrosion rate, and chloride ion concentration measurements were conducted until the indication of active reinforcement corrosion. Chloride contaminated concrete was removed to the rebar level through a grooving process. The grooves were chemically treated through solution pondings and backfilling with treated mortar. Seventeen treatments and combination of treatments were evaluated including corrosion inhibitors, polymer sealers, and a possible chloride ion scavenging mineral. The treatment effects were monitored using half-cell potential and corrosion rate measurements. In addition, mortar cubes were cast containing various treatment concentrations and were subsequently tested for compressive strength and change in resistivity over time. Based on the electrochemical and mortar cube measurements, DCI (calcium nitrite) when applied as a ponding and mortar treatment, was determined most effective in abating corrosion after concrete removal. In addition, Alox 901, Cortec 1337, Cortec 1609, sodium tetraborate, and Zinc borate were also found effective in mitigating rebar corrosion after concrete removal; however, both the borate compounds cause set retardation of portland cement. These chemicals were recommended as candidate treatments for further evaluation in both large-scale and field experimentation.en
dc.description.degreeMaster of Scienceen
dc.format.extentxiii, 167 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-08182009-040410en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08182009-040410/en
dc.identifier.urihttp://hdl.handle.net/10919/44282en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.C655.pdfen
dc.relation.isformatofOCLC# 24346651en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.C655en
dc.subject.lcshConcrete -- Corrosionen
dc.subject.lcshSteel -- Corrosionen
dc.titleChemical treatment of corroding steel reinforcement after removal of chloride contaminated concreteen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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