THE DETERMINATION OF TENSILE STRENGTH OF DIFFERENT TEXTURED GEOTEXTILES USED IN ROAD CONSTRUCTION

Abstract

The raise in the level of traffic and axle loads along with the construction errors and climatic conditions in the last decade has caused failures in pavements such as fatigue and low temperature cracking as well as permanent deformation. In order to minimize the above mentioned failures, geotextiles have been successfully employed by using their stabilization and reinforcement functions. Owing to these functions, geotextiles increase the strength of the pavement. In general, the higher tensile strength value the geotextiles have, the more resistive the pavement to permanent deformation This study aims to determine the properties of different types (continuous flament non-woven, needle punched non-woven, slit film yarns woven) of geotextiles that have different densities (200gr/m2, 300gr/m2, 400gr/m2, 450gr/m2) by conducting the "Standard Test Method for Tensile Properties of Geotextiles by the Wide-Width Strip Method" and the "Standard Test Method for Static Puncture Strength of Geotextiles and Geotextile Related Products Using a 50-mm Probe". In this way the utilization of geotextiles in road construction can be evaluated.

Keywords

• Geotextile,Tensile strength,Static puncture strength,Texture

YOL iNSAATINDA KULLANILAN GEOTEKSTiLLERiN ÇEKME DAYANIMLARININ DOKU FARKLILIGI YONUNDEN iNCELENMESi

Abstract

Giiniimiizde karayollanndaki trafik hacmindeki ve tasit dingil yiiklerindeki artislar ile birlikte, yol tasanmlannda yapilan yanhshklar ve imalat hatalan, yol ustyapilarmda yorulma ve dusuk catlaklanna ve ozellikle tekerlek izi olusurnlan gibi kalici deformasyonlara sebep olmaktadir. Kaplamalarda gorulen bozulmalan en aza indirmek amaciyla geotekstiller; stabilizasyon veya guclendirme fonksiyonlanndan yararlarnlarak kullarulrnaktadrr. Geotekstiller bu fonksiyonlan sayesinde, yol ustyapisuun dayarurmru arttirarak kaplamarun davrarusiru belirgin bir sekilde etkilemektedir. Kullamlacak geotekstilin cekme dayarnrm ne kadar yiiksek olursa, yol kaplamalanrun kahci deformasyonlara karst direnci de 0 kadar fazla olmaktadir. Bu cahsmada, yol ustyapisi ozelliklerini iyilestirme amaciyla kullamlan dokumah ve dokumasiz geotekstillerin miihendislik ozellikleri verildikten soma farkli tip (dokurnasiz igne ile birlestirilmis, dokumasiz siirekli flament, dokumah yassr film seritli) ve yogunluklardaki (200 gr/rrr', 300 gr/rrr', 400 gr/m", 450 gr/m'') geotekstil ornekleri iizerinde ASTM 4595-86'e gore "Genis En Cekme Dayamrm" ve ASTM 6241-98'e gore "Statik Delinme Dayamrru" deneyleri uygulanarak mukavemet ozellikleri karsilastmhp yol insaatmda kullamlabilirlikleri degerlendirilrnistir,

Keywords

• Geotekstil,Cekrne dayarurru,Statik delinme dayamrru,Doku

References

1. [1] Long, P.V., Bergado, D.T., Balasubramaniam, A.S., "Interaction Between Soil and Geotextile Reinforcements", Proceedings of the First ASCE Conference of Geo Institute (Geo Logan'97), Utah, USA, 372-393 (1997).
2. [2] McGown, A., Andrawes, K.Z., Wilson-Fahmy, R.F., Brady, K.C., "Strength Testing of Geotechnical Fabrics", Supplementary Report 703, Transport and Road Research Laborato ry, UK. (1981).
3. [3] Maneecharoen, J., "Factors Affecting the Laboratory Testing of Geotextiles", M. Eng. Thesis GE-96-13, School of Civil Engineering, Asian Institute of Technology, Bangkok, Thailand. (1997).
4. [4]Douglas, R.A., "Stiffness Of Geosynthetics-Built Unpaved Road Structures: Experimental Programme, Analysis and Results", Proceedings of the Geosynthetics'93, Vancouver, Canada, 65-79 (1993).
5. [5] Tsai, W.S., Savage, B.M., Holtz, R.D., Christopher, B.R., Allen, T.M., "Evaluation Of Geotextiles As Separators In A Full-Scale Road Test", Proceedings of the Geosynthetics'93, Vancouver, Canada, 35-48 (1993).
6. [6] Hausmann, M.R. "Engineering Principles of Ground Modification International ed.",McGraw-Hill, Singapore, 512 (1990).
7. [7] ASTM D4595-86, "Standard Test Method For Tensile Properties Of Geotextiles By The Wide-Width Strip Method", Annual Book of ASTM Standards, Section 4, Vol.
8. [8] Koerner, R.M. "Design with Geosynthetics 2nd edition,", Prentice Hall, 18 (1990).

9. [9] Santvoort, G.P.T.M. "Geotextiles and Geomembranes in Civil Engineering revised ed.", A.A. Balkema,Rotterdam, 93 (1994).
10. [10] Aksoy, LM., "Modern Yol lnsaannda Geotekstil Uygulamalan", Yiiksek Lisans Tezi,istanbul Teknik Unv. Fen Bilm. Ens. istanbul, Tiirkiye. (1993).
11. [11] ASTM D6241-98, "Standard Test Method for Static Puncture Strength of Geotextilesand Geotextile Related Products Using a 50-mm Probe", Annual Book of ASTM Standards, Section 4, Vol. 04.09, 1613-1618 (1999).
12. [12] Cazzuffi, D., Venesia, S., "The Mechanical Properties of Geotextiles: Italian Standard and Interlaboratory Test Comparison", Proceedings of the Third International Conference on Geotextiles, Vienna, Vol. 3, 695-700 (1986).
13. [13] Bergado, D.T., Youwai, S., Hai, C.N., Voottipruex, P., "Interaction of Non-Woven Neddle Punched Geotextiles Under Axisymmetric Loading Conditions", Geotextiles and Geomembranes, 19, 299-328 (2001).