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Falling Weight Deflectometer Interpretation of Pavement Behaviour 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)Conference paper, Oral presentation only (Refereed)
Abstract [en]

A rural county road consisting of a thin flexible pavement structure in southern Sweden was instrumented in year 2009 in order to monitor changes in pavement characteristics caused by seasonal variations in environmental factors. Subsurface pavement temperatures, moisture phase and moisture contents were constantly measured throughout the study with main focus on the spring thaw and recovery periods. The pavement structural response was surveyed by conducting Falling Weight Deflectometer (FWD) measurements during these periods. Changes in pavement layers moduli were estimated by performing backcalculations on the deflection data using the Evercalc computer program. Furthermore, deflection basin indices were analysed using the FWD data. Pavement stiffness decreased significantly when the base and the subgrade began to thaw. Changes in backcalculated layers moduli showed clear correlation with layers moisture content measurements. The field data showed a considerable decrease in the bearing capacity of the pavement structure when the highest annual moisture in subgrade was also registered. Both deflection basin indices and backcalculated layers moduli indicated that the pavement was weakest when the subgrade completely thawed. Thereafter, the pavement gradually regained its stiffness as the excess water drained out from the layers. Complete recovery of the pavement took more than one month. Backcalculations of the FWD data showed 63 percent loss in the subgrade modulus and 48 percent loss in granular base and subbase moduli respectively during spring thaw compared to the summer values.

Place, publisher, year, edition, pages
2012.
Keyword [en]
Deflectograph, Thaw, Bearing capacity, Moisture content
National Category
Infrastructure Engineering
Research subject
Road: Highway design, Road: Freeze-thaw
Identifiers
URN: urn:nbn:se:vti:diva-6951OAI: oai:DiVA.org:vti-6951DiVA: diva2:734496
Conference
EPAM 2012: 4th European pavement and asset management conference, Malmö, Sweden, 5–7 September.
Available from: 2014-07-17 Created: 2014-07-17 Last updated: 2016-02-25Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf