21.11 A2000 - Geotextile Specifications

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).