Geosynthetics June/July 2020 - 29

ability to remove moisture in saturated
and unsaturated conditions has proven
to have quantifiable benefits to roadways
and other civil structures.

Introduction to ELDG
In unsaturated soils, suction, or capillary forces, between soil particles holds
moisture. Conventional geotextiles and
drainage nets cannot provide drainage
to the moisture within base courses or
subgrades under unsaturated conditions.
The ELDG with wicking capability was
developed to remove water from soil via
capillary action. This woven geotextile
provides both mechanical and hydraulic
stabilization to roadways. It is a twocomponent geotextile that includes highmodulus black polypropylene fibrillated
yarns in the machine and cross-machine
direction as well as blue deep-groove
nylon fibers in the cross-machine direction of the geotextile. The hydrophilic
and hygroscopic nature of the nylon
fibers induce high capillary forces to
remove moisture out of unsaturated soils.
See Figures 1 and 2.

FIGURE 1 Side view of ELDG

The University of Alaska
Fairbanks: Rainfall infiltration
soil column tests (2009)
In 2009 the University of Alaska
Fairbanks conducted some rainfall
infiltration soil column tests. In these
tests, individual 8-inch (200-mm) columns of initially saturated silt were
placed on top of different geosynthetics. These included (1) a high-modulus

FIGURE 2 Deep-groove fibers
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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
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