Evaluation of Airport Subsurface Materials.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
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Pavement structures located in regions with seasonal changes encounter regular cycles of freezing and thawing. Such environmental factors must be considered so that it can be certain that the pavement can accommodate continuous aircraft loading. Eleven subsurface materials specified by the Federal Aviation Administration FAA were examined to determine their susceptibility to frost heave and thaw-weakening. All but two of the materials were found to be frost-susceptible under the U.S. Army Corps of Engineers criterion that no more than 3 of fines be smaller than 0.02 mm 0.78 x 10exp-3in.. The frost-susceptible materials were also evaluated using Asphalt Institute criteria, which also categorized them as frost-susceptible. The 11 materials were evaluated for susceptibility to thaw-weakening using the drainage model developed by Casagrande and Shannon 1951, which focuses on the permeability of the drainage layer. The final recommendations which are based only on a literature review are that, to reduce frost-susceptibility and thaw-weakening, the amount passing the no. 200 sieve should be kept lower than 2 and drainage layers should be installed below the pavement.
- Terminal Flight Facilities
- Construction Equipment, Materials and Supplies