Fly Ash Soil Stabilization for Non-Uniform Subgrade Soils, Volume II: Influence of Subgrade Non-Uniformity on PCC Pavement Performance White, David White, David Harrington, Dale Ceylan, Halil Ceylan, Halil Rupnow, Tyson
dc.contributor.department Institute for Transportation 2018-02-14T20:48:40.000 2020-06-30T04:51:15Z 2020-06-30T04:51:15Z Sat Jan 01 00:00:00 UTC 2005 2014-10-01 2005-04-01
dc.description.abstract <p>To provide insight into subgrade non-uniformity and its effects on pavement performance, this study investigated the influence of non-uniform subgrade support on pavement responses (stress and deflection) that affect pavement performance.</p> <p>Several reconstructed PCC pavement projects in Iowa were studied to document and evaluate the influence of subgrade/subbase non-uniformity on pavement performance. In situ field tests were performed at 12 sites to determine the subgrade/subbase engineering properties and develop a database of engineering parameter values for statistical and numerical analysis. Results of stiffness, moisture and density, strength, and soil classification were used to determine the spatial variability of a given property. Natural subgrade soils, fly ash-stabilized subgrade, reclaimed hydrated fly ash subbase, and granular subbase were studied. The influence of the spatial variability of subgrade/subbase on pavement performance was then evaluated by modeling the elastic properties of the pavement and subgrade using the ISLAB2000 finite element analysis program.</p> <p>A major conclusion from this study is that non-uniform subgrade/subbase stiffness increases localized deflections and causes principal stress concentrations in the pavement, which can lead to fatigue cracking and other types of pavement distresses. Field data show that hydrated fly ash, self-cementing fly ash-stabilized subgrade, and granular subbases exhibit lower variability than natural subgrade soils. Pavement life should be increased through the use of more uniform subgrade support. Subgrade/subbase construction in the future should consider uniformity as a key to long-term pavement performance.</p>
dc.description.comments <p>CTRE Project 01-90</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1044
dc.identifier.contextkey 6192085
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath intrans_reports/53
dc.language.iso en
dc.relation.ispartofseries IHRB Project TR-461; FHWA Project 4
dc.source.bitstream archive/|||Sat Jan 15 00:49:52 UTC 2022
dc.subject.disciplines Civil and Environmental Engineering
dc.subject.keywords fly ash
dc.subject.keywords long-term pavement performance
dc.subject.keywords non-uniformity
dc.subject.keywords stress and deflection responses
dc.subject.keywords subgrade/subbase
dc.title Fly Ash Soil Stabilization for Non-Uniform Subgrade Soils, Volume II: Influence of Subgrade Non-Uniformity on PCC Pavement Performance
dc.type article
dc.type.genre report
dspace.entity.type Publication
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relation.isAuthorOfPublication 3cb73d77-de43-4880-939a-063f9cc6bdff
relation.isOrgUnitOfPublication 0cffd73a-b46d-4816-85f3-0f6ab7d2beb8
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