9
This agency defines a composite pavement as a structure consisting of an HMA surface course
overlaying a PCC slab of relatively high bending resistance that acts as the principal load-
distributing component of the pavement system (IDOT, 2002).
This comprehensive design methodology includes sections such as potential use of
composite pavements,
minimum material requirements, design period,
structural design, traffic
factors, subgrade requirements, performance graded (PG) binder selection, design reliability,
minimum design thickness, pre-adjusted slab thickness, slab thickness adjustments, and typical
sections.
The equation provided to compute the thickness of the new HMA overlay, D
O
, is the following:
C
B
O
SN
0.33 D
D
0.40
−
×
=
(8)
Where
D
O
= thickness of HMA layer for new composite pavement (in)
SN
C
= composite pavement structural number (obtained from a nomograph in their guide)
D
B
= thickness of new PCC base course (in).
After the composite pavement design has been completed, it should be compared to the
minimum thickness and material requirements that are provided in the guide. Table 2
shows
these requirements.
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