A study of seasonal variations in roadway deflections, pavement temperatures, and thaw depths was conducted in the Fairbanks area during 1975 and 1976. Additional pavement deflection and thaw depth studies performed in the Anchorage area during 1976 were also included in this study. Pavement temperature observations show that in early April the average daily pavement temperature will begin to consistently rise above the average daily air temperature. By late April, thawing of the soils beneath a roadway pavement can occur even with average air temperatures as low as +25F. Benkleman Beam deflection levels nearly always continued to rise until thaw depths reached three to four feet, with deflections declining toward summer levels as thawing increased beyond these depths. To determine the highest spring deflection level for a given roadway a series of repeated deflection observations between two and six weeks after the start of thawing is recommended. The installation and use of frost tubes was found to provide a good indication of the progression of thawing and strength loss beneath a roadway.

Media Info

  • Pagination: 55 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00180865
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: AK/RD-78/1
  • Created Date: Sep 14 2002 12:00AM