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ASTM Selected Technical Papers
Geosynthetics: Microstructure and Performance
By
ID Peggs
ID Peggs
1
GeoSyntec Inc.
?
Boynton Beach, Florida
;
symposium chairman and editor
Search for other works by this author on:
ISBN-10:
0-8031-1298-X
ISBN:
978-0-8031-1298-8
No. of Pages:
177
Publisher:
ASTM International
Publication date:
1990

Filtration performance of a geotextile is related to its capacity to retain soil particles over time without clogging. A pore size determination such as the filtration opening size (FOS) is used to assess the geotextile's filtration behavior. Standard hydrodynamic methods use a soil with a uniformity coefficient (Cu) greater than 6, with the coarser particle size value at least twice the estimated FOS value, and with a d10 four times smaller than the FOS value. The filtration opening size determination, using such a soil, is greatly influenced by the size of the coarser particles and by their fraction. Pore size has been overestimated because of these factors and because of the curve continuity. The soil nature of the gradation curve and the quantity of soil used in the test may distort pore size determination, hide some phenomena, and lead to errors in interpretation.

The geotextile structure can be characterized by the mass per unit area, thickness, density of fibers, fiber diameter, porosity, and fabrication process.

This report includes the first results of a laboratory study performed at the Polytechnical School of Montreal, the University of Liège, the University of Grenoble, CEMAGREF (Antony, France), ENEL (Milano, Italy) and the Ontario Ministry of Transports (Toronto, Canada) on the interaction between geotextile structure and filtration opening size (FOS).

1.
Lombard
,
G.
,
Boutin
,
J.
, and
Rollin
,
A.
, “
Theoretical and Experimental Structure Analysis of Non-woven Heat-Bonded Filters
,” in
Proceedings
, Technical Conference of the Filter Society,
Greensboro, N.C.
,
05
1987
.
2.
Gerry
,
B. S.
and
Raymond
,
G. P.
, “
Equivalent Opening Size of Geotextiles
,”
Geotechnical Testing Journal
 0149-6115, Vol.
6
,
06
1983
, pp. 53–63.
3.
Mlynarek
,
J.
, “
Hydraulic Conductivity and Pore Size of Non-Woven Filter Fabrics
,”
Geotextiles and Geomembranes
 0266-1144, Vol.
2
,
1985
, pp. 65–77.
4.
ASTM Standard Test Method for Determining the Apparent Opening Size of a Geotextile
” (D 4751-87).
5.
ISO Tests for Geotextiles — Porometry: Determination of the Filtration Aperture
,” ISO/TC38/SC21N9E,
1984
.
6.
Fayoux
,
D.
, “
Filtration hydrodynamique des sols par les textiles
,” in
Proceedings
, Colloque International sur l'Emploi des Textiles en Géotechnique, Vol.
2
,
Paris
,
1977
, pp. 329–332.
7.
Bacci
,
R.
and
Venesia
,
S.
, “
Metodo per la determinazione del diametro di filtrazione dei geotessili
,”
Rivista Italiana di Geotecnica
, No.
4
,
1981
.
8.
Kovacs
,
G.
,
Seepage Hydraulics
,
Elsevier Scientific
,
New York
,
1981
.
9.
Bowles
,
J. E.
,
Physical and Geotechnical Properties of Soils
,
McGraw-Hill
,
New York
,
1979
.
10.
Van Vlack
,
L. H.
,
Elements of Materials Science and Engineering
,
Addison-Wesley
,
Reading, Mass.
,
1975
.
11.
Belisle
,
J.
, “
Etude de la mesure de l'ouverture de filtration des géotextiles non-tissés par tamisage hydrodynamique
,” Master's thesis,
Ecole Polytechnique de Montréal
,
06
1987
.
12.
Fayoux
,
D.
,
Cazzuffi
,
D.
, and
Faure
,
Y.
, “
The Determination of the Filtration Characteristics of Geotextiles
,” in
Proceedings
, Materials for Dams Conference,
Monte Carlo
,
1984
.
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