Technical information

3-16
0
5
10
15
20
25
30
1.00E-07 1.00E-05 1.00E-03 1.00E-01 1.00E+01 1.00E+03 1.00E+05 1.00E+0
7
Reduced Frequency [Hz]
Phase Angle [degrees]
Mix 1
Mix 2
Mix 3
Mix 4
Figure 3.3.7: Superimposed phase angle master curves @ 15.5ºC for mixes 1 to 4.
3.3.3 Falling Weight Deflections
FWD testing was conducted in the APT on June 14, 2004, before passes were applied
(embedded instrumentation was not activated during the test). The FWD loading plate
was 11.81 in. (300 mm) in diameter. A set of nine geophones was used, located at the
following offset distances from the center of the plate: 0, 8, 12, 18, 24, 36, 48, 60 and
72 in. (0, 0.20, 0.30, 0.46, 0.61, 0.91, 1.22, 1.52 and 1.83 m). Testing was performed in
centers of lane 1 and lane 2. Six drop sequences were applied in each lane, with each
drop consisting of three load levels: 65, 85 and 105 psi (0.448, 0.586 and 0.724 MPa).
The pavement surface temperature during the test was 86.5ºF (30.3ºC). The average
peak deflections measured at each load level are shown in Table 3.3.3. These results are
plotted in Figure 3.3.8 in which solid lines represent n1 deflections and dashed lines
represent n2 deflections; the three different marker types represent the three load levels.
As can be seen, when comparing the response between the n1 and n2 sections, the
deflection basins are very similar for offset distances greater than 0.46 m (18 in.).
Closer to the loading plate, the deflections in lane 2 are slightly but consistently larger.