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Elevated Temperature Effects on Smooth Geomembrane - Geotextile Interfaces
The mechanical properties of geosynthetic materials are strongly temperature dependent. Historically, most laboratory geosynthetic interface testing has been performed at room temperature. Information today is emerging that shows how temperatures in the liner systems of landfills can be much higher due to seasonal temperature variations as well as exothermic reactions occurring in the waste body. As part of an extensive research study undertaken to investigate temperature effects on interface shear behavior, a three-component study involving surface hardness tests, single filament tensile strength tests and interface shear tests between NPNW polypropylene geotextiles and both HDPE and PVC smooth geomembranes was undertaken. A temperature controlled chamber was utilized to simulate field elevated temperature conditions. The laboratory interface shear program included tests under a normal stress level of 100 kPa and a range of test temperatures from 21 to 50 °C. Complementary geotextile single filament tensile tests were performed over the same temperature range using a dynamic thermo-mechanical analyzer to evaluate the tensile strength properties of single geotextile filaments at these elevated temperatures. The surface hardness of smooth HDPE and PVC geomembrane samples was also determined at different temperatures in this range to evaluate how temperature change affected the surface hardness as well as the interface shear behavior and strength of smooth geomembranes in combination with geotextiles. The study showed that while the tensile properties of the geotextile filaments and the geomembrane surface hardness are both reduced, the interface strength increases. Quantitative measurements provide insight into the mechanisms dictating this behavior.
Elevated Temperature Effects on Smooth Geomembrane - Geotextile Interfaces
The mechanical properties of geosynthetic materials are strongly temperature dependent. Historically, most laboratory geosynthetic interface testing has been performed at room temperature. Information today is emerging that shows how temperatures in the liner systems of landfills can be much higher due to seasonal temperature variations as well as exothermic reactions occurring in the waste body. As part of an extensive research study undertaken to investigate temperature effects on interface shear behavior, a three-component study involving surface hardness tests, single filament tensile strength tests and interface shear tests between NPNW polypropylene geotextiles and both HDPE and PVC smooth geomembranes was undertaken. A temperature controlled chamber was utilized to simulate field elevated temperature conditions. The laboratory interface shear program included tests under a normal stress level of 100 kPa and a range of test temperatures from 21 to 50 °C. Complementary geotextile single filament tensile tests were performed over the same temperature range using a dynamic thermo-mechanical analyzer to evaluate the tensile strength properties of single geotextile filaments at these elevated temperatures. The surface hardness of smooth HDPE and PVC geomembrane samples was also determined at different temperatures in this range to evaluate how temperature change affected the surface hardness as well as the interface shear behavior and strength of smooth geomembranes in combination with geotextiles. The study showed that while the tensile properties of the geotextile filaments and the geomembrane surface hardness are both reduced, the interface strength increases. Quantitative measurements provide insight into the mechanisms dictating this behavior.
Elevated Temperature Effects on Smooth Geomembrane - Geotextile Interfaces
Karademir, Tanay (author) / Frost, David (author)
2013
10 Seiten, Bilder, Quellen
Conference paper
Storage medium
English
erhöhte Temperatur , Geotextil , Grenzflächenverhalten , Oberflächenhärte , Zugfestigkeit , exothermische Reaktion , Zugfestigkeitsprüfung , Scherprüfung , geosynthetischer Werkstoff , Polypropylen , Geomembran , Temperatureinfluss , Normalspannung (mechanisch) , Festigkeitseigenschaft , mechanische Eigenschaft
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