Abstract
The effects of variable granular subbase thickness on the structural responses of flexible airport pavement test sections subjected to six-wheel and four-wheel multiple-wheel heavy aircraft gear loading are discussed. Four low-strength subgrade flexible pavement sections at the National Airport Pavement Test Facility (NAPTF) with different subbase thicknesses (406, 610, 864, and 1,092 mm ) were considered. Heavy weight deflectometer (HWD) tests were conducted prior to traffic testing to document the uniformity of the test pavements. Surface deflection basins were obtained and the layer moduli were back-calculated. Traffic tests were conducted on test sections with the intention of failing the subgrade; in the meanwhile, rutting was monitored periodically. A two-dimensional pavement finite-element program was used to model the NAPTF test sections and compute the critical structural responses. Test sections with lower subbase thicknesses showed higher HWD maximum surface deflections ( D0 ) and higher comput...
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