For each gradation, two moisture contents were
selected to evaluate the sensitivity of permanent deformation
to the variation in moisture content. The two moisture
contents were 2.0% below the OMC and approximately at
the OMC content according to the Standard Proctor curve
for each gradation. All specimens were compacted at 99%
of the maximum dry density according to the Standard
Proctor curve. Two replicate specimens were tested at each
moisture content.