137
over the length of a highway pavement. The characteristics of each test
section are described in detail in Section 5.2.
Cores of the asphalt concrete layer were also obtained for labora
tory tests on the rheological properties of the recovered asphalt. The
rheology tests generally consisted of establishing the low temperature-
viscosity characteristics of the recovered asphalt (117) which were then
used to predict the modulus of the asphalt concrete layer. Other perti
nent data collected as part of this program include the location of
water table, pavement temperatures, and physical properties of the base,
subbase, and subgrade soil materials. Detailed information on these
testing procedures are presented in this chapter.
5.2 Location and Characteristics of Test Pavements
Most of the pavement sections used in the study had been scheduled
for evaluation by the FDOT. These sections, as listed in Table 5.1, are
representative of pavement deflection response, type of construction,
and soil-moisture conditions. Also shown in Table 5.1 are the year each
pavement was originally built and the last time it was resurfaced with
an overlay. Figure 5.1 shows the locations of the test pavement sec
tions on the map of Florida.
The thicknesses of surface and base layers for each pavement sec
tion are also listed in Table 5.1. The asphalt concrete thickness was
generally within the range listed in Table 4.1 for the theoretical anal
ysis. However, the base course thickness differed slightly from the 8.0
in. used in Table 4.1, except for the 24 in. at the SR 715 test site.
The subbase thicknesses were generally found to be 12.0 in., except for