Laboratory evaluation of freezing-thawing resistance of aggregate for concrete pavement using Iowa Pore Index Tests

dc.contributor.advisor Kejin Wang
dc.contributor.advisor Fatih Bektas
dc.contributor.author Ren, Jiaxi
dc.contributor.department Civil, Construction, and Environmental Engineering
dc.date 2018-08-11T06:13:48.000
dc.date.accessioned 2020-06-30T03:00:19Z
dc.date.available 2020-06-30T03:00:19Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2015
dc.date.embargo 2001-01-01
dc.date.issued 2015-01-01
dc.description.abstract <p>This study is aimed at evaluating Iowa pore index (IPI) test method for characterizing pores in aggregates that may have significant influence on freezing-thawing (F-T) durability of concrete. The study includes three phases: (a) evaluating the pore indexes of various concrete aggregates from different sources that mostly contain both carbonate and non-carbonate portions; (b) testing volumetric properties (such as specific gravity, absorption and desorption) of the aggregate; and (c) examining the correlations between these test results. Statistical analyses were also applied in the examination of these correlations.</p> <p>The results of this study suggest that IPI test is a quick and simple test method for aggregate pore structure evaluation. Carbonate aggregates generally have higher absorption, lower specific gravity, higher primary pore index (PPI), and much higher secondary pore index (SPI) (for a given absorption) than non-carbonate aggregates. The PPI and PPI+SPI measurements are closely related to absorption of aggregates (for carbonate, non-carbonate, and bulk aggregates). The correlations of SPI with aggregate absorption are very weak, especially for carbonate aggregate. This may be attributed by other unidentified factors (such as aggregate pore tortuosity and the IPI test pressure and time). A pattern has been observed for the residual of the linear regression model for SPI-absorption correlation, which suggests that a higher order regression may be needed to better describe the correlation between SPI and absorption for carbonate aggregate.</p> <p>More research should be conducted to further study the correlation between F-T durability and aggregate chemistry, mineralogy, and pore structure. Additional tests should also be done to develop statistical model better correlates the aforementioned testing results and aggregate property.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/14946/
dc.identifier.articleid 5953
dc.identifier.contextkey 8808429
dc.identifier.doi https://doi.org/10.31274/etd-180810-4552
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/14946
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/29130
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/14946/Ren_iastate_0097M_15386.pdf|||Fri Jan 14 20:29:06 UTC 2022
dc.subject.disciplines Civil Engineering
dc.subject.keywords Civil Engineering (Civil Engineering Materials)
dc.subject.keywords Civil Engineering
dc.subject.keywords Civil Engineering Materials
dc.title Laboratory evaluation of freezing-thawing resistance of aggregate for concrete pavement using Iowa Pore Index Tests
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
thesis.degree.level thesis
thesis.degree.name Master of Science
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