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Lab Services: Geosynthetic testing

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Test Method Title

Standard Test Methods for Water Permeability of Geotextiles by Permittivity

Reference Number

ASTM D4491

Material

Geotextile

Test Property

Permittivity, Permeability

Description of Test

Permittivity is determined by either a constant or falling head test. Constant Head Test—A head of 50 mm (2 in.) of water is maintained on the specimen throughout the duration of the test. The quantity of flow is measured versus time. The constant head test is used when the flow rate of water through the geotextile is so large that it is difficult to obtain readings of head change versus time in the falling head test. Falling Head Test—A column of water is allowed to flow through the geotextile and readings of head changes versus time are taken. The flow rate of water through the geotextile must be slow enough to obtain accurate readings.

Preferred Test Sample Size

3' x roll width

Number of Test Specimens

4

Test Specimen Size

2.2" diameter

Keywords

permittivity, flow rate, permeability

For more information, contact GeoTesting Express:



Atlanta

770.645.6575


Boston

978.635.0424


Chicago

224.676.1371


New York

212.566.6630



info@geotesting.com

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