Abstract
This paper presents a comparison study of the experimental results from the falling weight deflectometer (FWD) test, field rigid plate bearing load test, and laboratory resilient modulus test on granular subgrade materials in flexible pavements. The results showed that the average laboratory resilient moduli at optimum compacted conditions were 1.1 times higher than the average laboratory determined resilient moduli at in situ conditions. The FWD back-calculated moduli were about 1.6 times higher than the laboratory resilient moduli for the granular materials. The average laboratory determined maximum dry density was slightly higher than the average field measured in situ dry density. A hyperbolic model was proposed to represent the relationship of the load-deformation curve obtained from the field plate bearing load test. No significant relationship was found between the laboratory resilient modulus and the modulus of elasticity from the field plate bearing tests.
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