A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Durability of HDPE Geomembrane Seams Immersed in Brine for Three Years
This paper examines the long-term durability of two dual wedge welded 1.5-mm-thick high-density polyethylene (HDPE) geomembranes (GMBs). The two GMBs, which had different resins, and the welds initially met relevant standards. The welded GMBs were immersed in a brine solution with total dissolved solids and pH 8.7 at four different temperatures (40, 65, 75, and 85°C) for 3 years. Changes in standard oxidative induction time (Std-OIT) and high-pressure oxidative induction time (HP-OIT) were monitored at (1) the GMB well away from the weld, (2) the heat-affected zone beside the weld, and (3) the welded zone. The Std-OIT and HP-OIT depletion were fastest in the heat-affected zone adjacent to the weld and slowest in the weld itself. Both the Std-OIT and HP-OIT were still depleting, without having reached a residual value, when degradation in physical properties was observed. Brine has a greater effect on time to nominal failure for the peel break strength than for the shear break strength and elongation. Aging of the GMB in the heat-affected zone beside the weld controls the time to nominal failure. The importance of the welds in the consideration of GMB service-life is highlighted.
Durability of HDPE Geomembrane Seams Immersed in Brine for Three Years
This paper examines the long-term durability of two dual wedge welded 1.5-mm-thick high-density polyethylene (HDPE) geomembranes (GMBs). The two GMBs, which had different resins, and the welds initially met relevant standards. The welded GMBs were immersed in a brine solution with total dissolved solids and pH 8.7 at four different temperatures (40, 65, 75, and 85°C) for 3 years. Changes in standard oxidative induction time (Std-OIT) and high-pressure oxidative induction time (HP-OIT) were monitored at (1) the GMB well away from the weld, (2) the heat-affected zone beside the weld, and (3) the welded zone. The Std-OIT and HP-OIT depletion were fastest in the heat-affected zone adjacent to the weld and slowest in the weld itself. Both the Std-OIT and HP-OIT were still depleting, without having reached a residual value, when degradation in physical properties was observed. Brine has a greater effect on time to nominal failure for the peel break strength than for the shear break strength and elongation. Aging of the GMB in the heat-affected zone beside the weld controls the time to nominal failure. The importance of the welds in the consideration of GMB service-life is highlighted.
Durability of HDPE Geomembrane Seams Immersed in Brine for Three Years
Rowe, R. Kerry (author) / Shoaib, Mohamad (author)
2017-12-15
Article (Journal)
Electronic Resource
Unknown
Durability of HDPE Geomembrane Seams Immersed in Brine for Three Years
| British Library Online Contents | 2018
Laboratory Evaluation of HDPE Geomembrane Seams
| British Library Conference Proceedings | 1993
Factors Influencing HDPE Geomembrane Durability
| British Library Conference Proceedings | 2003
HDPE Geomembrane Seams: Acceptance Criteria and Critical Defects
| British Library Conference Proceedings | 1994
HDPE & VLDPE Geomembrane Survivability
| British Library Conference Proceedings | 1993