Economic Analysis
A simplified economic analysis was used to evaluate the feasibility of composite
pavement systems. The study consisted of a deterministic LCCA of the agency costs following
VDOT LCCA guidelines (VDOT, 2002) and a sensitivity analysis. These guidelines include
predefined work schedules for various pavement structures. Four types of pavements were
analyzed. The design was based on a typical section of Interstate 81 with an annual average
daily traffic (AADT) of 50,000 vehicles and 30% trucks yielding around 67,000,000 ESALs over
a 30-year pavement design period. The thicknesses for the typical flexible, rigid (CRCP), and
semi-rigid (Composite with CTB) pavements were obtained using the AASHTO 1993 method,
whereas the thickness for the composite pavement with CRCP base was based on the
mechanistic modeling and analysis in this study. To simplify the analysis, the shoulders were
assumed to have the same structural package as the pavement. Table 10 summarizes the
thickness of the various layers for the four structural designs considered in the LCCA.
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Table 10. Layer Thicknesses in mm (in) of the Pavement Structures used for the LCCA
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