geotextile non woven specification

7/28/2019 Geotextile Non Woven Specification

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Part 642

National Engineering Handbook

National Standard Material

Specifcations

Chapter 3

5921(210VINEH, January 2009)

1. ScopeThis specifcation covers the quality o geotextiles.

2. General requirementsFibers (threads and yarns) used in the manuacture

o geotextile shall consist o synthetic polymers com-

posed o a minimum o 85 percent by weight poly-

propylenes, polyesters, polyamides, polyethylene,

polyolefns, or polyvinylidene-chlorides. They shall

be ormed into a stable network o flaments or yarns

retaining dimensional stability relative to each other.

The geo-textile shall be ree o deects and conorm tothe physical requirements in tables 5921 and 5922.

The geotextile shall be ree o any chemical treatment

or coating that signifcantly reduces its porosity. Fibers

shall contain stabilizers and/or inhibitors to enhance

resistance to ultraviolet light.

Thread used or actory or feld sewing shall be o con-

trasting color to the abric and made o high strength

polypropylene, polyester, or polyamide thread. Thread

shall be as resistant to ultraviolet light as the geotex-

tile being sewn.

3. ClassifcationGeotextiles shall be classifed based on the method

used to place the threads or yarns orming the abric.

The geotextiles will be grouped into woven and non-

woven types.

WovenFabrics ormed by the uniorm and regular

interweaving o the threads or yarns in two directions.

Woven abrics shall be manuactured rom monofla-

ment yarn ormed into a uniorm pattern with distinct

and measurable openings, retaining their position

relative to each other. The edges o abric shall be sel-

vedged or otherwise fnished to prevent the outer yarnrom unraveling.

Material Speciication 592Geotextile

NonwovenFabrics ormed by a random place-

ment o threads in a mat and bonded by heat-bonding,

resin-bonding, or needle punching. Nonwoven abrics

shall be manuactured rom individual fbers ormed

into a random pattern with distinct, but variable small

openings, retaining their position relative to each

other when bonded by needle punching, heat, or resin

bonding. The use o nonwovens other than the needle

punched geotextiles is somewhat restricted (see note

3 o table 5922).

4. Sampling and testingThe geotextile shall meet the specifed requirements

(table 5921 or 5922) or the product style shown on

the label. Product properties as listed in the latest edi-

tion o the "Specifers Guide," Geosynthetics, (Indus-

trial Fabrics Association International, 1801 County

Road B, West Roseville, MN 55113-4061 or at http://

www.geosindex.com) and that represent minimum

average roll values, are acceptable documentation

that the product style meets the requirements o these

specifcations.

For products that do not appear in the above directory

or do not have minimum average roll values listed,typical test data rom the identifed production run o

the geotextile will be required or each o the specifed

tests (tables 5921 or 5922) as covered under clause

AGAR 452.236-76.

5. Shipping and storageThe geotextile shall be shipped/transported in rolls

wrapped with a cover or protection rom moisture,

dust, dirt, debris, and ultraviolet light. The cover shall

be maintained undisturbed to the maximum extend

possible beore placement.

Each roll o geotextile shall be labeled or tagged to

clearly identiy the brand, class, and the individual pro-

duction run in accordance with ASTM D 4873.


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Part 642



Specifcations

Chapter 3

5922 (210VINEH, January 2009)

Table 5921 Requirements or woven geotextiles

Property Test method Class I Class II & III Class IV

Tensile strength

(pounds) 1/ASTM D 4632

grab test

200 minimum

in any principal

direction

120 minimum

in any principal

direction

180 minimum in any

principal direction

Elongation at ailure

(percent) 1/ASTM D 4632

grab test


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Part 642



Specifcations

Chapter 3

5923(210VINEH, January 2009)

1/ Minimum average roll value (weakest principal direction).

2/ U.S. standard sieve size.3/ Heat-bonded or resin-bonded geotextile may be used or classes III and IV. They are particularly well suited to class IV. Needle-punched

geotextiles are required or all other classes.

Table 5922 Requirements or woven geotextiles

Property Test method Class I Class II Class III Class IV 3/

Tensile strength

(lb) 1/ASTM D 4632

grab test

180 minumum 120 minumum 90 minumum 115 minumum

Elongation at

ailure(%) 1/ASTM D 4632 50 50 50 50

Puncture (pounds) ASTM D 4833 80 minumum 60 minumum 40 minumum 40 minumum

Ultraviolet light

(% residual

tensile strength)

ASTM D 4355

150-hr exposure

70 minumum 70 minumum 70 minumum 70 minumum

Apparent opening

size (AOS)

ASTM D 4751 As specifed

max.#40 2/As specifed

max.#402/As specifed

max.#402/As specifed

max.#402/

Permittivity sec1 ASTM D 4491 0.70 minumum 0.70 minumum 0.70 minumum 0.10 minu-

mum

Material Specifcation 592 Geotextile (continued)


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(210VINEH, January 2009)

geotextile non woven specification

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