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The effects of coatings and sealers used to mitigate alkali-silica reaction and/or delayed ettringite formation in hardened Concrete

Since 2006, research funded by the Texas Department of Transportation (TxDOT) has evaluated the use of coatings and sealers for mitigating expansion due to alkali-silica reaction (ASR) and/or delayed ettringite formation (DEF) in hardened concrete. The report herein includes a project summary of previous work in Phase I, led by Racheal Lute (2008) and Charles Rust (2009). The Phase II research, described in this thesis, established concrete exposure blocks and NCHRP 244 Series II testing as the cornerstones of characterizing coating effectiveness. The studies assessed coating system performance by examining the contribution of steel reinforcement, the effects of aggregate reactivity, the size limitations of treatments, and the impact of painted concrete substrates. Lastly, this thesis describes the preliminary results of a field study site of columns supporting a flyover, and a concrete exposure block site in Houston, Texas. Overall, the results are encouraging as several coatings have reduced expansion by lowering internal relative humidity.

Identiferoai:union.ndltd.org:UTEXAS/oai:repositories.lib.utexas.edu:2152/31328
Date15 September 2015
CreatorsWehrle, Evan Richard, 1985-
ContributorsFolliard, Kevin J.
Source SetsUniversity of Texas
LanguageEnglish
Detected LanguageEnglish
TypeThesis, Thesis
Formatelectronic
RightsCopyright © 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., Restricted
RelationUT Electronic Theses and Dissertations

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