Performance assessment of stabilized pavement subgrades

dc.contributor.advisor David White
dc.contributor.author Li, Wenjuan
dc.contributor.department Civil, Construction, and Environmental Engineering
dc.date 2018-08-11T08:18:18.000
dc.date.accessioned 2020-06-30T02:27:49Z
dc.date.available 2020-06-30T02:27:49Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2011
dc.date.embargo 2013-06-05
dc.date.issued 2011-01-01
dc.description.abstract <p>Chemical stabilization of subgrades is one of traditional technologies to provide a pavement construction platform. Laboratory test results of a typical mix design including soil strength and stiffness measurements are usually well documented in the short term. However, the long-term performance data of stabilized pavement are lack and desired for further development of this technology.</p> <p>In order to address those problems, nine test sections were selected to assess engineering properties of old stabilized subgrades in Texas, Oklahoma, and Kansas. Six subgrades were stabilized with lime and three subgrades stabilized with fly ash. Ages of these stabilized subgrades ranged from 5 to 28 years. Both laboratory and in-situ tests were performed. Laboratory tests include moisture content, sieve analysis, pH test, scanning electron microscope, and unconsolidated-undrained test. In-situ tests include dynamic cone penetrometer, falling weight deflectometer, light weight deflectometer, plate load test, and soil sampling. Using engineering research international (ERI) data analysis software, the subgrade layer moduli were backcalculated based upon FWD tests results.</p> <p>Soil types, pH values, mineralogical and microstructure analysis, and the improvement ratios between stabilized and un-stabilized subgrades were presented in this study. At some test sites, the field observation found that lime was not uniformly mixed with subgrades. SEM analysis shows some cementing products formed and existed in lime stabilized subgrade samples. Based on the laboratory and in-situ test results, the improved soil strength and stiffness remained after many years of construction.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/10348/
dc.identifier.articleid 1340
dc.identifier.contextkey 2798708
dc.identifier.doi https://doi.org/10.31274/etd-180810-187
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/10348
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/24561
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/10348/Li_iastate_0097M_12325.pdf|||Fri Jan 14 18:19:10 UTC 2022
dc.subject.disciplines Civil and Environmental Engineering
dc.subject.keywords Pavement Stiffness
dc.subject.keywords Subgrade Stabilization
dc.title Performance assessment of stabilized pavement subgrades
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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