Optimal configuration and test parameters for the comprehensive test system for geomembrane liners
- Univ. of South Florida, Tampa, FL (United States). Dept. of Civil and Environmental Engineering
Barriers to contaminant migration are a critical part of waste control engineering. Geomembranes (GMs) form one of the two key types of impermeable layer used in barrier systems. The other key barrier material is clay. Clays benefit from a very long history of geotechnical experience tying a range of laboratory tests, some very simple, to design interpretations in which the engineer may have confidence; GMs do not. The Comprehensive Test System (CTS) has been developed at the University of South Florida to permit testing of geomembrane liners in a manner that is both faster than current chemical-compatibility tests and more representative of exposure conditions. The test employs multi-axial deformation with cyclic loading, and can simultaneously expose the liner to potentially-hostile chemicals. These capabilities have been employed to develop a test protocol that generates a single-number parameter expressive of material strength. The test system has recently undergone upgrades and modifications to improve test reproducibility. In conjunction with the assessment of the changes and their effects, test parameters were evaluated. Data from an investigation will be presented to demonstrate the performance of the system. Key results from the range-finding effort, which was largely qualitative, will be discussed. Two are most important: First, the current commonly-employed strain rate is too fast. Second, it is possible to employ the CTS to produce significant differences without causing failure of the membrane, which is far different from current testing protocols, and should be of far greater interest to designers.
- OSTI ID:
- 353625
- Report Number(s):
- CONF-970677-; TRN: IM9929%%171
- Resource Relation:
- Conference: 90. annual meeting and exhibition of the Air and Waste Management Association, Toronto (Canada), 8-13 Jun 1997; Other Information: PBD: 1997; Related Information: Is Part Of 1997 proceedings of the Air and Waste Management Association`s 90. annual meeting and exhibition; PB: [7000] p.
- Country of Publication:
- United States
- Language:
- English
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