Geosynthetics February/March 2021 - 27

high weight of water that may break
posts of weaker construction or less
frequent spacing. In another example,
a compost filter sock installed with
a 3-inch (76-mm) installation trench
may provide better soil retention than
a compost filter sock with no installation trench. Since the effectiveness of
SRDs is installation dependent, this
test method is indicative of actual field
performance when installed with the
appropriate techniques.
D7351 apparatus and procedures
The test method is commonly executed
using the following equipment:
*	 A mixing tank with an internal paddle
mixer device mounted on scales
*	 A sufficient source of water and associated pumping equipment to fill the
mixing tank in a timely manner
*	 A collection tank mounted on scales
of sufficient volume to accommodate
all runoff passing the SRD

Keystone Compac®

Keystone Retaining Walls

The mixing and collection tanks are
separated by areas, or zones, as shown in
Figure 4. A nonpermeable slope surface
immediately below the mixer discharge
spreads the initial discharge and provides
a retention zone above the installation
zone. The installation zone is comprised
of prepared soil subgrade to allow fullscale installation of the SRD to be tested.
Regal Stone Pro®
The area below the installation zone is
The combination of geogrids and Keystone units provides a proven
nonpermeable to facilitate efficient transintegrated wall system. Keystone segmental walls economically offer
mission of runoff passing the SRD to the
structural stability, durability, and a wide range of aesthetic options.
collection tank.
A representative sample of the SRD
to be tested is installed in the installation zone in accordance with the manufacturer's recommendations. A sediment-laden runoff is then created by
combining water and soil in the mixing
FebMar_2021_KRW_Geosynthetics_4.5x7.5.indd 1
12/30/20
tank and maintaining agitation during
the test. A typical " construction phase "
sediment concentration for testing is
6%. The rationale for the " construction

11:30 AM

www.GeosyntheticsMagazine.com

25


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Geosynthetics February/March 2021

Table of Contents for the Digital Edition of Geosynthetics February/March 2021

Geosynthetics February/March 2021 - 1
Geosynthetics February/March 2021 - 2
Geosynthetics February/March 2021 - 3
Geosynthetics February/March 2021 - 4
Geosynthetics February/March 2021 - 5
Geosynthetics February/March 2021 - 6
Geosynthetics February/March 2021 - 7
Geosynthetics February/March 2021 - 8
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Geosynthetics February/March 2021 - 11
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Geosynthetics February/March 2021 - 24
Geosynthetics February/March 2021 - 25
Geosynthetics February/March 2021 - 26
Geosynthetics February/March 2021 - 27
Geosynthetics February/March 2021 - 28
Geosynthetics February/March 2021 - 29
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Geosynthetics February/March 2021 - 47
Geosynthetics February/March 2021 - 48
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