Temperature Effects on Internal Shear Behavior in Reinforced GCLs
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 146, Issue 1
Abstract
The objective of this study was to evaluate the strength reduction of heat-treated and non-heat-treated needle-punched geosynthetic clay liners (NP GCLs) at elevated temperatures. For this purpose, a series of stress-controlled rapid-loading shear tests were performed on two NP GCLs with similar peel strength but different heat treatment. Tests were performed at temperatures of 20°C, 40°C, 60°C, and 80°C under three different normal stresses (20, 40, and 60 kPa). Internal shear behavior of NP GCLs was described as a three-mechanism conceptual model. Elevated temperature resulted in a systematic decrease in the shear stress at failure in both heat-treated and non-heat-treated NP GCLs. The internal shear strength and shear deformation mechanisms in NP GCLs are dependent on the strength of reinforcement fibers and fiber bundle–geotextile connection. Thus, the internal shear behavior of NP GCLs as a function of temperature was evaluated via changes in the tensile modulus of monofilament fibers and entanglement strength of fiber bundle–geotextile connections. In heat-treated GCLs, an increase in test temperature to 80°C reduced the tensile modulus of reinforcement fibers. In non-heat-treated GCLs, an increase in test temperature to 80°C reduced the fiber bundle–geotextile entanglement strength. These reductions in tensile modulus and fiber bundle entanglement strength corresponded to reductions in internal shear strength of NP GCLs.
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Acknowledgments
Financial support for this study was provided by the Colloid Environmental Technologies Company (CETCO), Geosynthetic Research Institute (GRI), and Colorado State University (CSU). The opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily represent the views of CETCO, GRI, or CSU.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 146 • Issue 1 • January 2020
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©2019 American Society of Civil Engineers.
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Received: Jun 20, 2018
Accepted: Aug 21, 2019
Published online: Nov 12, 2019
Published in print: Jan 1, 2020
Discussion open until: Apr 12, 2020
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