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

Figure 4.22 The elastic deformation versus the number of loading cycles for the 15 cm thick
geocell-reinforced RAP base section (hard subgrade)
Figure 4.23 shows the measured maximum strains on the geocell wall at different
locations during the cyclic plate load test. The symbols, orientations, and locations of strain
gauges affixed on geocell wall are shown in figure 4.3. The maximum strains were recorded
manually during the test. It is shown that the tensile strains developed at all of the top gauges
while the compressive strains occurred at the middle gauges. The higher strains occurred at the
central geocell under the loading plate. The strain at the bottom of the central geocell could not
measure as it broke down during construction of base layer.
The strains at the bottom of the HMA surface were measured by the pavement strain
gauges at distances of 0, 12.5, 25, 50, and 75 cm away from the center as shown in figure 4.24.
In this research, the strain is positive under tension and negative at compression. The bottom of
the HMA surface at the distances of 0, 12.5, 50, and 75 cm away from the center was under
tension and that at the distance of 25 cm from the center was under compression up to the end of
the test.
Elastic deformation (mm.)
3
2
1
0
0 2000 4000 6000 8000 10000 12000 14000 16000
Number of loading Cycle
66