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Investigation of a pavement structural behaviour during spring thaw using falling weight deflectometer
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)
2013 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, Vol. 14, no 1, 141-158 p.Article in journal (Refereed) Published
Abstract [en]

The response of an instrumented flexible pavement structure in southern Sweden, subjected to seasonal freeze–thaw cycles, was investigated during the spring thaw and the recovery periods in 2010. The pavement environmental condition was continuously monitored by measuring subsurface temperature and moisture contents. The mechanical behaviour of the pavement structure was investigated by conducting frequent falling weight deflectometer (FWD) measurements throughout the study period. Considerable decrease in the pavement-bearing capacity was observed as thaw penetrated the pavement structure and consequently moisture content increased in all pavement unbound layers. Highest annual moisture content in the subgrade upper section was registered as thaw penetrated the subgrade and pavement exhibited its weakest structural condition. The analyses of the deflection basin indices and back-calculated unbound layer stiffness from the FWD measurements exhibited a clear correlation with the measured subsurface moisture content. Furthermore, the dissipated energy measured from the FWD time–history data was calculated, exhibiting its highest annual value during the thawing period. Using the back-calculated layer stiffness and moisture measurements in unbound layers, a degree of saturation-based moisture-stiffness model was developed for the granular layer and the subgrade. This model fell on a unique curve showing promising agreement with the laboratory-based model proposed by Mechanistic-Empirical Pavement Design Guide that analytically predicts changes in modulus due to changes in moisture.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2013. Vol. 14, no 1, 141-158 p.
Keyword [en]
Deflectograph, Spring (season), Thaw, Bearing capacity, Moisture content
National Category
Infrastructure Engineering
Research subject
Road: Highway design, Road: Freeze-thaw; Road: Highway design, Road: Pavement design
Identifiers
URN: urn:nbn:se:vti:diva-6939DOI: 10.1080/14680629.2012.754600OAI: oai:DiVA.org:vti-6939DiVA: diva2:734481
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
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • asciidoc
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