GEOTEXTILECASE STUDY: Railway renewal in Turkey

Project title
Railway renewal in Turkey

General information:
Date of project: 2002 – 2006
Location: between Susurluk and Bandırma in Turkey.
Project description: this railtrack has been constructed over poor soil leading to deformations and highmaintenance costs. Rail track renovation and the simultaneous installation of a geotextile separator andﬁlter provided the solution.
Owner: Turkish Railway Department.

¸ Makinaları San. Ve Tic. A.S.
¸Contractor: Tekno Insaat
DuPontTM Typar® SF Beneﬁts: low elongation with a high degree of strength with very thin geotextile.
Style: DuPontTM Typar® SF 85.
Size: 20 km long.

GEOTEXTILE

Installation• The renovation of the railtrack was facilitated using
a special railtrack renovation machine. This machine
lifts the rail track including the sleepers and remove
the top layer of contaminated ballast. Then DuPontTM
Typar® SF is unrolled, new and cleaned ballast is
dropped on top of the geotextile. The track is placedback onto the ballast layer and more ballast is added,
which will be compacted in a separate step.

L-11254 07/2006 Copyright © 2006 DuPont. All rights reserved. The DuPont Oval Logo, DuPontTM, The miracles of scienceTM and Typar® are registered trademarks or trademarks of E. I. du Pont de Nemours and Company or its afﬁliates.

• Thickness of new aggregate (ballast) layer on top of
the geotextile: approx. 30 cm.
• Ballast: Diameter 50 - 100 mm.

Comments:DuPontTM Typar® SF was considered to be the best
option not only because of its unique combinationof properties, which results in the high damage resistance (high energy = high damage resitance).
But also because it is so thin. The geometry of the renovation equipment dictates the amount of space available
for the geotextile roll. The thinner the geotextile is, themore meters are on a roll of 30 cm.
With a speed of 80 m/h the renovation process is slow.

For each geotextile roll exchange more time is lost.
Using DuPontTM Typar® SF reduces the number of interruptions due to its minimal thickness and thus accelerates the installation. Not only does DuPontTM Typar® SFfulﬁll the required properties despite its “thinness”, thisunique feature here even is an advantage!

Selection:• The entire DuPontTM Typar® SF range is CE certiﬁedby ItBU (Institut für textile Bau- und Umwelttechnik)
as a notiﬁed body.
• DuPontTM Typar® SF has previously been successfully
installed in this type of installation.
• DuPontTM Typar® SF has previously shown/provenan excellent long term performance with a highdamage resistance.
• Reference article: the use of spunbonded
geotextile in railway track renewal St. PetersburgMoscow; E.S. ASHPIZ, University of Transport
Engineers, Moscow, Russia, R. DIEDERICH & C.
KOSLOWSKI, DuPont de Nemours, Luxembourg,
IGC Nice 2002.

DuPont de Nemours (Luxembourg) S.àr.l.
Rue Général Patton
L-2984 Luxembourg
Tél: +352 3666 5779
Fax: +352 3666 5021
www.typargeo.com
This information corresponds to our current knowledge on the supject. It is offered solely
to provide possible suggestions for your own experimentations. It is not intended, however, tosubstitute for any testing you may need to conduct to determine for yourself the suitability ofour products for your particular purposes. This information may be subject to revision as new
knowledge and experience becomes available. Since we cannot anticipate all variations in actual end-use conditions. DuPont makes no warrantiesand assumes no liabilities in connection
with any use of this information. Nothing in this publication is to be considered as a license tooperate under or a recommendation to infringe any patent righ