Lesson 3/Learning Event 4
Problem #3: Frost Design
Design the flexible pavement for frost for T/O airfield Problem #1. Assume that the subbase material is
NOT frost susceptible. The F-4C has a single wheel landing gear with 100 in2 of contact area.
Solution
Step 1 - Determine the total pavement thickness.
The subgrade is classified as an F-4 because it is a silt. Use the
curve for F-3, but expect "objectionable surface roughness."
Using a 26.0 kip gear load, the total pavement thickness is 28"
(Fig. 13-15) for Type B. Reduce by 10% for a Type C (25.2").
Step 2 - Determine the thickness design.
Step 3 - Add compaction requirements and draw the final design profile as for temperate design.
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