Laboratory and field evaluations of external sulfate attack

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dc.contributor.advisor Folliard , Kevin J . en_US
dc.contributor.advisor Thomas , Michael D . A . en_US
dc.identifier.oclc 192097774 en_US
dc.creator Drimalas , Thanos , 1980 - en_US
dc.date.accessioned 2008 -08 -28T23 :56 :03Z
dc.date.accessioned 2014 -02 -19T22 :34 :21Z
dc.date.available 2008 -08 -28T23 :56 :03Z
dc.date.available 2014 -02 -19T22 :34 :21Z
dc.date.created 2007 -12 en_US
dc.date.issued 2008 -08 -28T23 :56 :03Z
dc.identifier.uri http : / /hdl .handle .net /2152 /3569
dc.description.abstract External sulfate attack is a complex process that can result in concrete structures deteriorating prematurely . This dissertation describes a comprehensive evaluation of factors influencing external sulfate attack and includes both laboratory and field investigations . Significant emphasis was placed on evaluating the sulfate resistance of mortar and concrete containing high -calcium fly ash (Class C fly ash as per ASTM C 618 ) . This investigation showed that these fly ashes generally reduced the sulfate resistance of mortar and concrete , but that sulfate resistance was possible through the incorporation of other supplementary cementing materials (silica fume and ultra fine fly ash ) into these mixtures . Another key area of emphasis in this project was the correlation between accelerated laboratory tests and outdoor exposure site performance . The behavior of concrete exposed to various sulfate salts (sodium , magnesium , and calcium ) was evaluated , both in static immersion tests and in outdoor sulfate trenches . It was found that the distress outdoors was exacerbated by physical sulfate attack , especially when concrete was exposed to sodium sulfate . It was found that lowering the water -tocementitious ratio (w /cm ) and incorporating appropriate dosages of suitable supplementary cementing materials improved resistance to both chemical and physical forms of sulfate attack . Lastly , a comprehensive study of bridges throughout Texas discovered concrete structures suffering from possible external sulfate attack . The use of analytical techniques such as x -ray diffraction (XRD ) and scanning electron microscopy (SEM ) were used throughout the study to determine the presence of hydration products that may form with mortars and concrete specimens . Findings from this research will be implemented in specifications in Texas for the use of Class C fly ash use in concrete in areas that may have sulfate soils and groundwater . en_US
dc.format.medium electronic en_US
dc.language.iso eng en_US
dc.rights Copyright © is held by the author . Presentation of this material on the Libraries' web site by University Libraries , The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works . en_US
dc.subject.lcsh Concrete - -Deterioration en_US
dc.subject.lcsh Sulfate -resistant concrete en_US
dc.title Laboratory and field evaluations of external sulfate attack en_US
dc.description.department Civil , Architectural , and Environmental Engineering en_US
dc.identifier.recnum b69695763 en_US
dc.type.genre Thesis en_US
dc.type.material text en_US
thesis.degree.name Doctor of Philosophy en_US
thesis.degree.level Doctoral en_US
thesis.degree.discipline Civil Engineering en_US
thesis.degree.grantor The University of Texas at Austin en_US
thesis.degree.department Civil , Architectural , and Environmental Engineering en_US

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Laboratory and field evaluations of external sulfate attack. Doctoral dissertation, The University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /3569 .

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