Onsite Use of Recycled Asphalt Pavement Materials and Geocells to ...

The profiles of the HMA surfaces as shown in figure 4.38 were measured from the
reference beam before and after the cyclic plate load test. It shows that a depression (equivalent
to rutting under traffic) developed under the loading plate and some heaving occurred away from
the loading plate after the test.
Depth (cm.)
7
10
13
16
Before Test
After Test
-100 -80 -60 -40 -20 0 20 40 60 80 100
Distance from center (cm.)
Figure 4.38 Profiles of the HMA surface before and after the test for the 23 cm thick geocellreinforced
RAP base section
The permanent deformation was obtained after unloading of each cycle. Figure 4.39
presents the measured permanent deformations of the pavement at the surface, at the top of the
base, and at the top of the subgrade. The difference in the permanent deformations between the
HMA surface and the base is the compression of the HMA surface while that between the base
and the subgrade is the compression of the base course. The surface deformations at different
distances from the center were obtained by the displacement transducers. It is shown that the
surface permanent deformation was higher at the center and decreased with the distances of 25,
and 50 cm away from the center. The elastic deformation was higher at the beginning of loading
and then decreased slightly at a small rate until the end of the test as shown in figure 4.40. The
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