Geosynthetics June/July 2019 - 28

Using geosynthetics in flexible airport pavements

a

b

c

d

multiple, equilateral directions to form
triangular apertures; GP 2, a punched
polypropylene sheet oriented in longitudinal and transverse direction to form
biaxial rectangular apertures; GP 3 and
GP 4, both made up of polypropylene
yarns manufactured in an interlocking
longitudinal and transverse direction
to form biaxial rectangular apertures;
and GP 5, a geosynthetic comprised of
polypropylene filaments formed into an
innovative weave. Specific mechanical
properties published by the manufacturer of each geosynthetic product are
shown in Table 5.

FIGURES 3a-3e Physical appearance of
geosynthetic products: a) Geosynthetic
product 1, b) Geosynthetic product 2, c)
Geosynthetic product 3, d) Geosynthetic
product 4, e) Geosynthetic product 5

e

Instrumentation layout
Pressure cells, linear variable displacement transducers (LVDTs) and pore
pressure transducers were installed
throughout the pavement structure to
monitor surface deformation and quantify the response of each pavement structure during cyclic loading. A series of six
LVDTs were placed transversely along
Geosynthetic Product (GP)

Mechanical Property

Method

Units

GP 1

GP 2

GP 3

GP 4

Triaxial Geogrid Biaxial Geogrid Biaxial Geogrid Biaxial Geogrid

Woven
Geotextile

Aperture Dimension (MD)

Measured

inches

Triangular

1×1

0.60 × 0.60

1.35 × 1.35

N/A

Minimum Rib Thickness (MD)

Measured

inches

-

0.05

-

-

N/A

Tensile Strength @ 2% Strain (MD)

ASTM D6637

lb./ft.

-

410

548

1,030

540

Tensile Strength @ 2% Strain (CMD)

ASTM D6637

lb./ft.

-

620

890

1,030

2,160

Tensile Strength @ 5% Strain (MD)

ASTM D6637

lb./ft.

-

810

1,370

2,190

1,560

Tensile Strength @ 5% Strain (CMD)

ASTM D6637

lb./ft.

-

1,340

1,850

2,190

4,920

Ultimate Tensile Strength (MD)

ASTM D6637

lb./ft.

-

1,310

1,850

2,740

-

Ultimate Tensile Strength (CMD)

ASTM D6637

lb./ft.

-

1,970

2,398

2,740

-

Resistance to UV Degradation

ASTM D4355

%

100

100

-

-

90

Mass/Unit Area

ASTM D5261

oz./SY

-

-

6.5

11

-

Longitudinal Rib Pitch

Measured

inches

1.6

-

-

-

-

Diagonal Rib Pitch

Measured

inches

1.6

-

-

-

-

Radial Stiffness @ 0.5% Strain

ASTM D6637

lb./ft.

15,430

-

-

-

-

TABLE 5 Geosynthetic product specifications per the manufacturer data sheets
28

GP 5

Geosynthetics | June July 2019



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
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Geosynthetics June/July 2019 - 19
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Geosynthetics June/July 2019 - 21
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Geosynthetics June/July 2019 - 50
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Geosynthetics June/July 2019 - 53
Geosynthetics June/July 2019 - 54
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Geosynthetics June/July 2019 - 56
Geosynthetics June/July 2019 - Cover3
Geosynthetics June/July 2019 - Cover4
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