Table 4 - 44: Geotextile Properties for Underground Drainage
Geotextile Property Requirements(1)
Low Survivability
Moderate Survivability
Geotextile Property
Test Method
Woven/Nonwoven
Woven/Nonwoven
Grab Tensile Strength, min. in machine and x-machine direction
ASTM D4632
180 lbs/115 lbs min.
250 lbs/160 lbs min.
Grab Failure Strain, in machine and x-machine direction
ASTM D4632
<50%/>50%
<50%/>50%
Seam Breaking Strength (if seams are present)
ASTM D4632 and
ASTM D4884 (adapted for grab test)
160 lbs/100 lbs min.
220 lbs/140 lbs min.
Puncture Resistance
ASTM D6241
370 lbs/220 lbs min.
495 lbs/310 lbs min.
Tear Strength, min. in machine and x-machine direction
ASTM D4533
67 lbs/40 lbs min.
80 lbs/50 lbs min.
Ultraviolet (UV) Radiation stability
ASTM D4355
50% strength retained min., after 500 hrs. in a xenon arc device
50% strength retained min., after 500 hrs. in a xenon arc device
NOTES:
(1) All geotextile properties are minimum average roll values (i.e., the test result for any sampled roll in a lot shall meet or exceed the values shown in the table).
Table 4 - 45: Geotextile for Underground Drainage Filtration Properties (Same as WSDOT Standard Specification 9-33.2(1) - Table 1)
Geotextile Property Requirements(1)
Geotextile Property
Test Method
Class A
Class B
Class C
ASOS(2)
ASTM D4751
#40 sieve max
#60 sieve max
#80 sieve max
Water Permittivity
ASTM D4491
.5 sec -1 min.
.4 sec -1 min.
.3 sec -1 min.
NOTES:
(1) All geotextile properties are minimum average roll values (i.e. the test result for any sampled roll in a lot shall meet or exceed the values shown in the table).
(2) Apparent Opening Size (measure of diameter of the pores in the geotextile).
Table 4 - 46: Geotextile Strength Properties for Impermeable Liner Protection (Same as WSDOT Standard Specification 9-33.2(1) - Table 2.)
Geotextile Property
Test Method
Geotextile Property Requirements(1)
Grab Tensile Strength, min. in machine and x-machine direction
ASTM D4632
250 lbs min.
Grab Failure Strain, in machine and x-machine direction
ASTM D4632
>50%
Seam Breaking Strength (if seams are present)
ASTM D4632 and
ASTM D4884
(adapted for grab test)
220 lbs min.
Puncture Resistance
ASTM D4833
125 lbs min.
Tear Strength, min. in machine and x-machine direction
ASTM D4533
90 lbs min.
Ultraviolet (UV) Radiation
ASTM D4355
50% strength stability retained min., after 500 hrs. in a xenon arc device
NOTES:
(1)All geotextile properties are minimum average roll values (i.e., the test resut for any sampled roll in a lot shall meet or exteed the values shown in the table).