Technical information

3-25
the centerline of the loading path. Strain gauges G-5, G-6, G-7 and G-8 were located
along a parallel line positioned two feet (0.61 m) from the loading path. Gauges G-2, G-
4, G-5 and G-7 were measuring horizontal strains in the loading direction (i.e., strain in
Y) while gauges G-1, G-3, G-6 and G-8 were measuring horizontal strains in the
transverse direction (i.e., strain in X).
Table 3.5.1: Location of APT instrumentation in Section n1 (relate to Figure 3.5.1).
Gauge ID Gauge Type
Location in X,
in. (m)
Location in Y,
in. (m)
Depth in Z,
in. (mm)
#1178
Pressure
Cell
0.0
72 (1.83) 5 (127)
# 1179
96 (2.44)
11 (279)
#1184
144 (3.66)
#1185
168 (4.27)
5 (127)
G-1
Strain Gauge
84 (2.13)
G-2
108 (2.74)
G-3
132 (3.35)
G-4
156 (3.96)
G-5
24 (6.1)
84 (2.13)
G-6
108 (2.74)
G-7
132 (3.35)
G-8
156 (3.96)
3.5.2 Resilient Response
The resilient response data presented and discussed hereafter was obtained from Section
n1 during testing that took place between July and August 2004 (see Table 3.4.1 and
discussion in Subsection 3.4.2). Recall that the loading was stopped after 90,000 passes
due to bond failure that occurred at the interface between the surface and intermediate
HMA lifts. Figures 3.5.2, 3.5.3 and 3.5.4 show the resilient strains and stresses
measured during APT passes 5,000 and 80,000 vs. the APT carriage location which
corresponds to the Y-axis in Figure 3.5.1. In each of these figures, a solid line
represents pass #5,000 and a dashed line represents pass #80,000. As is customary for
geomaterials, a positive sign indicates compression and a negative sign indicates tension
of either stress or strain.