Effect of vibration on freeze-thaw resistance of concrete

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dc.contributor.author Ghadban, Ahmad A.
dc.date.accessioned 2016-04-18T19:00:25Z
dc.date.available 2016-04-18T19:00:25Z
dc.date.issued 2016-05-01 en_US
dc.identifier.uri http://hdl.handle.net/2097/32515
dc.description.abstract Pre-stressed concrete is used for manufacturing railroad ties. Air entrainment is used in concrete railroad ties to provide durability in freeze-thaw conditions commonly present in track. Vibration practices in pre-stressed concrete railroad tie plants could contribute to excessive air loss during manufacture and thus poor freeze-thaw resistance. Rheological properties of fresh concrete significantly influence the determination of how much air is lost during vibration. This research attempted to increase understanding of the effect of vibration on air bubble distribution and freeze-thaw resistance of concrete given certain compositions and rheological properties of concrete. The objective was achieved by examining the effect of different admixtures combinations, vibration parameters, and rheological properties on the air void system and freeze-thaw resistance of concrete. This research also proposed a method to measure rheological properties of concrete when vibrated and for concrete mixtures too stiff to measure using conventional rheology measurements. Results showed that delaying the initiation of vibration can cause significant air loss but does not necessarily decrease freeze-thaw performance of concrete. Results also showed that a majority of air loss occurs in the first 30 seconds of vibration. The types of admixtures used in the concrete mixture can significantly affect the air system and freeze-thaw durability of concrete; this effect was shown to be more pronounced in mixtures with low yield stress and plastic viscosity. While the peak vibration acceleration had a mild effect, the frequency and peak velocity of vibration did not seem to have a noticeable effect on the air system and freeze-thaw performance of concrete. Results also showed that rheological properties of stiff mixtures can be estimated by running the rheology test during vibration. en_US
dc.description.sponsorship Federal Railroad Administration en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Concrete en_US
dc.subject Freeze-Thaw en_US
dc.subject Vibration en_US
dc.subject Rheology en_US
dc.title Effect of vibration on freeze-thaw resistance of concrete en_US
dc.type Dissertation en_US
dc.description.degree Doctor of Philosophy en_US
dc.description.level Doctoral en_US
dc.description.department Civil Engineering en_US
dc.description.advisor Kyle Riding en_US
dc.date.published 2016 en_US
dc.date.graduationmonth May en_US

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