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Performance of geotextile separators in laboratory model tests
When a highway is constructed over a soft subgrade, failure most commonly occurs when the base and/or subbase aggregate becomes intermixed with the subgrade soil. A geotextile can be placed between the aggregate and the subgrade to act as a separator to prevent the subgrade and aggregate base course from mixing. This paper describes on-going laboratory model tests to investigate geotextile performance under conditions that simulate loading conditions in roadways. The performance of different geotextiles used for stabilization of soft subgrade soils, as well as their long-term performance in the pavement system, are being evaluated. The test results are presented, and the survivability and filtration performance of the geotextiles is evaluated and compared. It is summarized, that Task Force 25 criteria and recommendations can be applied to special heatbonded nonwoven geotextile with 136 g/m2 ('HB4') with respect to survivability but may be conservative for needlepunced nonwoven geotextile with also 136 g/m2 ('NP4). The use of separators with different moduli can cause different final rut depths and result in different periods of time to dissipate pore pressure.
Performance of geotextile separators in laboratory model tests
When a highway is constructed over a soft subgrade, failure most commonly occurs when the base and/or subbase aggregate becomes intermixed with the subgrade soil. A geotextile can be placed between the aggregate and the subgrade to act as a separator to prevent the subgrade and aggregate base course from mixing. This paper describes on-going laboratory model tests to investigate geotextile performance under conditions that simulate loading conditions in roadways. The performance of different geotextiles used for stabilization of soft subgrade soils, as well as their long-term performance in the pavement system, are being evaluated. The test results are presented, and the survivability and filtration performance of the geotextiles is evaluated and compared. It is summarized, that Task Force 25 criteria and recommendations can be applied to special heatbonded nonwoven geotextile with 136 g/m2 ('HB4') with respect to survivability but may be conservative for needlepunced nonwoven geotextile with also 136 g/m2 ('NP4). The use of separators with different moduli can cause different final rut depths and result in different periods of time to dissipate pore pressure.
Performance of geotextile separators in laboratory model tests
Leistungsfähigkeit geotextiler Trennmaterialien in Labortests
Tsai, W.S. (author) / Holtz, R.D. (author)
1994
4 Seiten, 3 Bilder, 2 Tabellen, 6 Quellen
Conference paper
English
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