Abstract
To investigate the gradual failure of high-density polyethylene (HDPE) geomembrane as a result of long-term corrosion, four dynamic corrosion tests were conducted at different temperatures and durations. By combining tension and puncture tests, we systematically studied the variation law of tension and puncture properties of the HDPE geomembrane under different corrosion conditions. Results showed that tension and puncture failure of the HDPE geomembrane was progressive, and tensile strength in the longitudinal grain direction was evidently better than that in the transverse direction. Punctures appeared shortly after puncture force reached the puncture strength. The tensile strength of geomembrane was in inversely proportional to the corrosion time, and the impact of corrosion was more obvious in the longitudinal direction than transverse direction. As corrosion time increased, puncture strength decreased and corresponding deformation increased. As with corrosion time, the increase of corrosion temperature induced the decrease of geomembrane tensile strength. Tensile and puncture strength were extremely sensitive to temperature. Overall, residual strength had a negative correlation with corrosion time or temperature. Elongation variation increased initially and then decreased with the increase in temperature. However, it did not show significant law with corrosion time. The reduction in puncture strength and the increase in puncture deformation had positive correlations with corrosion time or temperature. The geomembrane softened under corrosion condition. The conclusion may be applicable to the proper designing of the HDPE geomembrane in landfill barrier system.
Highlights
The high-density polyethylene (HDPE) geomembrane is a major part of the barrier system in a landfill that helps to inhibit the diffusion of leachate from polluting groundwater
The long-term reliability of the HDPE geomembrane is the key to guaranteeing the ecological security of a landfill
Large deformations, puncture holes, and tears occur under complicated pressures generated by the landfill refuse dump because the HDPE geomembrane is prone to uneven settlement and punctures
Summary
The high-density polyethylene (HDPE) geomembrane is a major part of the barrier system in a landfill that helps to inhibit the diffusion of leachate from polluting groundwater. The mechanical properties of materials, such as the tensile and puncture strength, determine the sealing effect of the HDPE geomembrane in landfill application. Studies on the mechanical deformation characteristics and other issues related to HDPE geomembranes in engineering applications have been conducted through experiments, theories, and numerical simulations These studies mainly focused on the interface properties of geomembrane and other earthwork synthetic materials [2,3,4,5,6,7,8,9,10,11,12,13,14,15], of which very few was involved with the tensile and puncture properties of geomembranes [16,17,18,19]. The conclusions reached in this study can provide critical date support for the quantitative evaluation of HDPE geomembrane as well as the designing and optimization of landfills
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