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Pavement Unbound Materials Stiffness-Moisture Relationship during Spring Thaw
Swedish National Road and Transport Research Institute, Infrastructure. Royal Institute of Technology, KTH. (Pavement Technology)ORCID iD: 0000-0001-9482-1691
Swedish National Road and Transport Research Institute, Infrastructure. University of Iceland. (Pavement Technology)
2012 (English)In: Cold Regions Engineering: Sustainable Infrastructure Development in a Changing Cold Environment / [ed] Brian Morse and Guy Doré, American Society of Civil Engineers (ASCE), 2012, 402-412 p.Conference paper (Refereed)
Abstract [en]

In the study presented here, the mechanical behaviour of a flexible pavement structure and its correlation to the pavement profile moisture condition was investigated during the spring thaw and the recovery periods. The study was carried out based on continuous pavement environmental data measurements as well as frequent Falling Weight Deflectometer (FWD) tests during 2010. Measurements were taken on a relatively thin flexible pavement (≤ 100 mm Hot Mix Asphalt, HMA) in southern Sweden where frost penetration of 1.2 m was observed during the winter. Considerable decrease in the pavement bearing capacity was observed as the moisture content in unbound layers increased during spring thaw. Both pavement deflection basins and backcalculated layer stiffness indicated clear correlation with thaw penetration and measured moisture content. Pavement structure was weakest as the thaw penetrated the subgrade. During the same period, highest annual moisture content at the upper part of the subgrade was also registered. Furthermore, using the field moisture measurements and backcalculated layer stiffness, a moisture-stiffness model was developed for granular layers and subgrade. The backcalculated layer stiffness and the pavement moistures measurements fell on a unique curve and showed promising agreement with the MR-Moisture laboratory-based predictive model used in ME-PDG.

Place, publisher, year, edition, pages
American Society of Civil Engineers (ASCE), 2012. 402-412 p.
Keyword [en]
Flexible pavement, Stiffness, Moisture content, Freezing thawing cycle, Bearing capacity
National Category
Infrastructure Engineering
Research subject
Road: Highway design, Road: Freeze-thaw
Identifiers
URN: urn:nbn:se:vti:diva-6948DOI: 10.1061/9780784412473.040ISBN: 978-0-7844-1247-3 (print)OAI: oai:DiVA.org:vti-6948DiVA: diva2:734493
Conference
Fifteenth International Specialty Conference on Cold Regions Engineering,Quebec City, Canada August 19-22.
Available from: 2014-07-17 Created: 2014-07-17 Last updated: 2016-02-25Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
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  • en-US
  • fi-FI
  • nn-NO
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  • sv-SE
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Output format
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  • asciidoc
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