UFC 3-260-03
15 Apr 01
(4) When the nonrigid overlay is between two thicknesses of rigid pavement, the only tests
required are those to establish the gradation and bitumen content of the bituminous concrete and the
gradation of the base-course material, if any.
c. Flexible Pavement Base Course, Subbase course, and Subgrade. Classification data consisting
of Atterberg limits, gradation, dry soil color, and specific gravity should be obtained from design and
construction-control tests or from tests performed on samples of base course, subbase, and subgrade
materials. Moisture-density and CBR relations should be determined from available data or from samples
of base course, subbase, and subgrade materials remolded at three compaction efforts as described in
CRD-C 653 and CRD-C 654.
d. Rigid Pavement Base Course and Subgrade. Classification data including gradation, Atterberg
limits, specific-gravity and moisture-density relations should be established. For the evaluation of a non-
rigid overlay, on rigid pavements, the moisture-density/CBR relation may be required. Undisturbed
samples of the subgrade will be subjected to an adaptation of the consolidation test to determine the
correction for saturation of the plate-bearing test results. The undisturbed samples may also be used for
density determinations. For the evaluation of a nonrigid overlay on rigid pavement, soaked laboratory
CBR tests on undisturbed samples of the subgrade material may be required.
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