Geosynthetics June/July 2019 - 25

Pavement performance was measured
in terms of traffic benefit ratio (TBR)
through comparison of the reinforced to
the non-reinforced pavement as defined
by American Association of State Highway
and Transportation Officials (AASHTO)
R50-09. Instrumentation was placed at
several locations within the pavement to
obtain pavement deflections, stress and
strain response parameters. The quantity of
sensors and specific locations are described
later in the instrumentation layout.
Representative flexible airport pavement structures were constructed within
a 6 × 6 × 6 foot (1.8 × 1.8 × 1.8 m) steel
test box to a design depth of 52 inches
(132 cm) and consisted of 5 inches (12.7
cm) of hot-mix asphalt (HMA) surface
layer, 7 inches (17.8 cm) of P-209 crushed
aggregate base course, 12 inches (30.5
cm) of P-154 subbase and more than 28
inches (71.1 cm) of subgrade, as shown
in Figure 2. Cyclic plate loading was performed using a 50,000-pound (222.4-kN)
Gilmore hydraulic actuator controlled
with an MTS System Corporation control system. A 28,800-pound (128-kN)
load was applied to pavement through
a 12-inch (30.5-cm) diameter plate to
achieve a 254.6 psi (1,755 kPa) load,
simulating a common aircraft loading
condition. Each load pulse was applied
for a total duration of 1.2 seconds. The
sinusoidal load was applied for 0.3 seconds followed by a 0.9-second rest period.
Loading was applied to each pavement
test item until failure, defined as 1 inch
(2.5 cm) and 2 inches (5.1 cm) permanent
surface deformation.
A total of 10 test items were completed through two phases. Phase I, completed in 2016, included four test items

FIGURE 1 Post-test excavated cross section

28,800-lb. Load

12" Diameter Plate

5.0" Hot Mix Asphal t

Phase I Placement
Phase II Placement

7.0" P-209 Aggregate Base Course
12.0" P-154 Aggregate Subbase

6 ft.
28" CH Subgrade (CBR = 3)

6 ft.
Pavement Structure Profile View

(Not to Scale)

FIGURE 2 Representative pavement structure profile view

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Geosynthetics June/July 2019

Table of Contents for the Digital Edition of Geosynthetics June/July 2019

Geosynthetics June/July 2019 - Cover1
Geosynthetics June/July 2019 - Cover2
Geosynthetics June/July 2019 - 1
Geosynthetics June/July 2019 - 2
Geosynthetics June/July 2019 - 3
Geosynthetics June/July 2019 - 4
Geosynthetics June/July 2019 - 5
Geosynthetics June/July 2019 - 6
Geosynthetics June/July 2019 - 7
Geosynthetics June/July 2019 - 8
Geosynthetics June/July 2019 - 9
Geosynthetics June/July 2019 - 10
Geosynthetics June/July 2019 - 11
Geosynthetics June/July 2019 - 12
Geosynthetics June/July 2019 - 13
Geosynthetics June/July 2019 - 14
Geosynthetics June/July 2019 - 15
Geosynthetics June/July 2019 - 16
Geosynthetics June/July 2019 - 17
Geosynthetics June/July 2019 - 18
Geosynthetics June/July 2019 - 19
Geosynthetics June/July 2019 - 20
Geosynthetics June/July 2019 - 21
Geosynthetics June/July 2019 - 22
Geosynthetics June/July 2019 - 23
Geosynthetics June/July 2019 - 24
Geosynthetics June/July 2019 - 25
Geosynthetics June/July 2019 - 26
Geosynthetics June/July 2019 - 27
Geosynthetics June/July 2019 - 28
Geosynthetics June/July 2019 - 29
Geosynthetics June/July 2019 - 30
Geosynthetics June/July 2019 - 31
Geosynthetics June/July 2019 - 32
Geosynthetics June/July 2019 - 33
Geosynthetics June/July 2019 - 34
Geosynthetics June/July 2019 - 35
Geosynthetics June/July 2019 - 36
Geosynthetics June/July 2019 - 37
Geosynthetics June/July 2019 - 38
Geosynthetics June/July 2019 - 39
Geosynthetics June/July 2019 - 40
Geosynthetics June/July 2019 - 41
Geosynthetics June/July 2019 - 42
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Geosynthetics June/July 2019 - 45
Geosynthetics June/July 2019 - 46
Geosynthetics June/July 2019 - 47
Geosynthetics June/July 2019 - 48
Geosynthetics June/July 2019 - 49
Geosynthetics June/July 2019 - 50
Geosynthetics June/July 2019 - 51
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Geosynthetics June/July 2019 - 53
Geosynthetics June/July 2019 - 54
Geosynthetics June/July 2019 - 55
Geosynthetics June/July 2019 - 56
Geosynthetics June/July 2019 - Cover3
Geosynthetics June/July 2019 - Cover4
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