Geosynthetics June/July 2020 - 30

Enhanced moisture management of pavement systems through capillary suction

FIGURE 3 Silt column test configuration

woven geotextile without the deepgroove fibers, (2) a woven monofilament geotextile, (3) a drainage composite made from high compressive
strength cores and combined with nonwoven filter fabrics and (4) the ELDG.
Each configuration was then underlain
with an impermeable membrane to
encourage lateral drainage, thus preventing any moisture from escaping
directly underneath the geosynthetic,
as seen in Figure 3.
Results from these tests indicated
that the ELDG removed 3%-4% more
moisture from the soil column than any
of the other geosynthetics, as shown in
Figure 4.
According to Budhu (2010), Equation
1 can be used to compare the undrained
shear strengths of two samples of the
same soil based on the differences in
moisture content.
(su)A
(su)B

= exp

Gs(wB-wA)
λ

(1)

where:
su = undrained shear strength
Gs = specific gravity of soil (~2.7 for silt)
w = water content
λ = compression index (0.15 typical
for silt)

FIGURE 4 Average moisture content distribution for silt column test

30

In this test, a 3% reduction in moisture content leads to q ~70% increase
in undrained shear strength of the
silt material.
"Since all tested geosynthetics are
permeable under saturated conditions
and the heights of the soil columns
were small (8 inches [200 mm]), gravity
induced water flow will not cause differences in moisture content distributions in the soil columns. Therefore, the
differences in moisture content distributions in the soil columns are caused
by unsaturated water flow induced by
differences in suction head" (Zhang and
Belmont 2009).

Geosynthetics | June July 2020

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5/20/20 6:15 PM



Geosynthetics June/July 2020

Table of Contents for the Digital Edition of Geosynthetics June/July 2020

Geosynthetics June/July 2020 - Cover1
Geosynthetics June/July 2020 - Cover2
Geosynthetics June/July 2020 - 1
Geosynthetics June/July 2020 - 2
Geosynthetics June/July 2020 - 3
Geosynthetics June/July 2020 - 4
Geosynthetics June/July 2020 - 5
Geosynthetics June/July 2020 - 6
Geosynthetics June/July 2020 - 7
Geosynthetics June/July 2020 - 8
Geosynthetics June/July 2020 - 9
Geosynthetics June/July 2020 - 10
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Geosynthetics June/July 2020 - 12
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Geosynthetics June/July 2020 - 14
Geosynthetics June/July 2020 - 15
Geosynthetics June/July 2020 - 16
Geosynthetics June/July 2020 - 17
Geosynthetics June/July 2020 - 18
Geosynthetics June/July 2020 - 19
Geosynthetics June/July 2020 - 20
Geosynthetics June/July 2020 - 21
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Geosynthetics June/July 2020 - 23
Geosynthetics June/July 2020 - 24
Geosynthetics June/July 2020 - 25
Geosynthetics June/July 2020 - 26
Geosynthetics June/July 2020 - 27
Geosynthetics June/July 2020 - 28
Geosynthetics June/July 2020 - 29
Geosynthetics June/July 2020 - 30
Geosynthetics June/July 2020 - 31
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Geosynthetics June/July 2020 - 34
Geosynthetics June/July 2020 - 35
Geosynthetics June/July 2020 - 36
Geosynthetics June/July 2020 - 37
Geosynthetics June/July 2020 - 38
Geosynthetics June/July 2020 - 39
Geosynthetics June/July 2020 - 40
Geosynthetics June/July 2020 - 41
Geosynthetics June/July 2020 - 42
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Geosynthetics June/July 2020 - 44
Geosynthetics June/July 2020 - 45
Geosynthetics June/July 2020 - 46
Geosynthetics June/July 2020 - 47
Geosynthetics June/July 2020 - 48
Geosynthetics June/July 2020 - Cover3
Geosynthetics June/July 2020 - Cover4
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-october-november-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-august-september-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-february-march-2021
https://www.nxtbook.com/ifai/geosynthetics/1220GS
https://www.nxtbook.com/ifai/geosynthetics/1020GS
https://www.nxtbook.com/ifai/geosynthetics/0820GS
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