Comparative evaluation of subgrade resilient modulus from non-destructive, in-situ, and laboratory methods.
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2007-08-01
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Edition:Final report; 7/2003-3/2006.
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Abstract:Field and laboratory testing programs were conducted to develop models that predict the resilient modulus of subgrade soils from
the test results of DCP, CIMCPT, FWD, Dynaflect, and soil properties. The field testing program included DCP, CIMCPT, FWD,
and Dynaflect testing, whereas the laboratory program included repeated load triaxial resilient modulus tests and physical
properties and compaction tests. Nine overlay rehabilitation pavement projects in Louisiana were selected. A total of four soil
types (A-4, A-6, A-7-5, and A-7-6) were considered at different moisture-dry unit weight levels. The results of the laboratory and
field testing programs were analyzed and critically evaluated. A comprehensive statistical analysis was conducted on the collected
data. The results showed a good agreement between the predicted and measured resilient modulus from the various field test
methods considered. The DCP and CIMCPT models were enhanced when the soil moisture content and dry unit weight were
incorporated. The results also showed that, among all backcalculated FWD moduli, those backcalculated using ELMOD 5.1.69
software had the best correlation with the measured Mr. Finally, the Mr values estimated using the approach currently adopted by
the LADOTD were found to correlate poorly with the measured Mr values.
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