VTechWorks staff will be away for the winter holidays starting Tuesday, December 24, 2024, through Wednesday, January 1, 2025, and will not be replying to requests during this time. Thank you for your patience, and happy holidays!
 

Determination of chloride diffusion constants for concretes of differing water to cement ratios and admixtures

Simple item page
dc.contributor.authorSmith, David Gilmanen
dc.contributor.committeechairWeyers, Richard E.en
dc.contributor.committeememberWalker, Richard D.en
dc.contributor.committeememberArdekani, Siamak A.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2014-03-14T21:37:41Zen
dc.date.adate2012-06-10en
dc.date.available2014-03-14T21:37:41Zen
dc.date.issued1988-08-05en
dc.date.rdate2012-06-10en
dc.date.sdate2012-06-10en
dc.description.abstractReinforced concrete exposed to chlorides is subject to rapid deterioration once the concentration of the chloride ion in the concrete reaches a critical level to cause corrosion of the reinforcing steel. The chloride ion diffuses through concrete according to Fick's Law, which is a function of time, a driving concentration, and a diffusion constant. The diffusion constant varies with temperature and the variety of concrete . The research included determination of diffusion constants for six types of concretes after 8 weeks and 16 weeks of ponding with an NaC1 solution. In addition, one set of these samples was subjected to the outside environment while the other was indoors under controlled conditions. The mixes included water to cement ratios of 0.35, 0.40, 0.45, and 0.50, and two water to cement ratios of 0.45 with 15% cement replacement with pozblan admixtures (silica fume and type'F flY ash). Thus, the effects of temperature, water to cement ratio, and pozzolanic admixtures in regard to the diffusion constant for concrete were found. The method by,which a diffusion constant was found is as 1)X3% solution of-NaC1 is ponded on top of a four inch thick 'specimen of concrete. 2) Powder samples of the paste are taken at specified time at depths of -0.5, 1.0 1,:5, and 2-.5 inches. 3) These samples are analyzed for chloride content by potentiometric titration. 4) The data is fit to Fick's Law by nonlinear regression and an effective diffusion constant determined.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 41 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06102012-040303en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06102012-040303/en
dc.identifier.urihttp://hdl.handle.net/10919/43056en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1988.S554.pdfen
dc.relation.isformatofOCLC# 18616458en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1988.S554en
dc.subject.lcshConcrete -- Dissolutionen
dc.subject.lcshCorrosion and anti-corrosivesen
dc.titleDetermination of chloride diffusion constants for concretes of differing water to cement ratios and admixturesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
LD5655.V855_1988.S554.pdf
Size:
1.53 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Masters Theses