Durable high early strength concrete

dc.contributor.authorPorras, Yadira A.
dc.date.accessioned2018-04-12T18:08:01Z
dc.date.available2018-04-12T18:08:01Z
dc.date.graduationmonthMayen_US
dc.date.issued2018-05-01en_US
dc.date.published2018en_US
dc.description.abstractBased on a 2017 report on infrastructure by the American Society of Civil Engineers, 13% of Kansas public roads are in poor condition. Furthermore, reconstruction of a two-lane concrete pavement costs between $0.8 and $1.15 million dollars per lane mile. High early strength Portland cement concrete pavement (PCCP) patches are widely used in pavement preservation in Kansas due to the ability to open to traffic early. However, these repairs done by the Kansas Department of Transportation (KDOT) deteriorate faster than expected, though, prompting a need for inexpensive, durable high early strength concrete repair mixtures that meet KDOT standards (i.e., a 20-year service life). This study developed an experimental matrix consisting of six PCCP patching mixture designs with varying cement content and calcium chloride dosage. The mixtures were subjected to isothermal calorimetry, strength testing, drying shrinkage, and various durability tests. The effects of cement content and calcium chloride dosage on concrete strength and durability were then investigated. In addition, the compressive strength development with time, the split tensile versus compressive strength relationship, and the shrinkage strain of the PCCP patching mixtures were compared to established relationships provided by the American Concrete Institute (ACI). Results showed a maximum 3% increase in total heat generated by various concrete paste samples in isothermal calorimetry testing. The minimum compressive strength of 1,800 psi required by KDOT could likely be obtained using any of the PCCP mixtures, regardless of the cement content or calcium chloride dosage used in the study. Furthermore, surface resistivity tests for mixtures containing calcium chloride could result in erroneous measurements. Only one mixture satisfied the maximum expansion and minimum relative dynamic modulus of elasticity required by KDOT. Some ACI relationships for shrinkage and strength development do not appear to be valid for high early strength PCCP patching mixtures.en_US
dc.description.advisorMustaque A. Hossainen_US
dc.description.degreeMaster of Scienceen_US
dc.description.departmentDepartment of Civil Engineeringen_US
dc.description.levelMastersen_US
dc.description.sponsorshipKansas Department of Transportation (KDOT) under its Kansas Transportation Research and New Developments (K-TRAN) programen_US
dc.identifier.urihttp://hdl.handle.net/2097/38761
dc.language.isoen_USen_US
dc.publisherKansas State Universityen
dc.subjectHigh early strengthen_US
dc.subjectDurabilityen_US
dc.subjectRapid repairen_US
dc.subjectConcreteen_US
dc.subjectPavementen_US
dc.subjectPatchesen_US
dc.subjectCalcium chlorideen_US
dc.subjectHigh cement contenten_US
dc.titleDurable high early strength concreteen_US
dc.typeThesisen_US

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