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Lifetime Prediction of Thin HDPE Geomembranes for the Shrimp Aquaculture Industry
High-density polyethylene (HDPE) geomembrane (GMB) is commonly specified as the preferred lining for shrimp aquaculture industry in South East Asia. Shrimp farms generally consist of extensive water canals surrounding grow-out, culture and treatment ponds. The water canals and ponds are relatively shallow in depth and commonly designed and constructed to 1.5m to 2.5m deep. Both the water canals and ponds are generally lined with thin gauge (≤0.75mm) HDPE GMBs mainly to maintain water level and control of water quality amongst other lining benefits. Due to the shallow depths, a significant section of the GMB lined canals and shrimp aquaculture ponds are therefore exposed to direct sunlight between the water freeboard level to the crest of bund and hence susceptible to UV degradation. The durability and lifetime prediction of HDPE GMBs particularly for the landfill industry where the common thicknesses range between 1.0mm to 2.5mm depending on the design and regulation of respective countries around the world have received much attention from engineers and researchers alike. However, there is a lack of information from the industry on the lifetime prediction of thin HDPE GMBs installed in the exposed environment particularly common to the shrimp aquaculture industry in South East Asia. Furthermore the properties of thin (0.75mm) HDPE GMBs are not covered by the industry standard of "GRI Test Method GM13" and needs to be extrapolated. This paper seeks to collate available information on the durability and lifetime prediction of GRI GM13 standard HDPE GMBs both in the exposed and buried environment and proposes a cautious extrapolation method in order to arrive at a reasonable lifetime prediction for the thinner gauge GMBs for the shrimp aquaculture industry.
Lifetime Prediction of Thin HDPE Geomembranes for the Shrimp Aquaculture Industry
High-density polyethylene (HDPE) geomembrane (GMB) is commonly specified as the preferred lining for shrimp aquaculture industry in South East Asia. Shrimp farms generally consist of extensive water canals surrounding grow-out, culture and treatment ponds. The water canals and ponds are relatively shallow in depth and commonly designed and constructed to 1.5m to 2.5m deep. Both the water canals and ponds are generally lined with thin gauge (≤0.75mm) HDPE GMBs mainly to maintain water level and control of water quality amongst other lining benefits. Due to the shallow depths, a significant section of the GMB lined canals and shrimp aquaculture ponds are therefore exposed to direct sunlight between the water freeboard level to the crest of bund and hence susceptible to UV degradation. The durability and lifetime prediction of HDPE GMBs particularly for the landfill industry where the common thicknesses range between 1.0mm to 2.5mm depending on the design and regulation of respective countries around the world have received much attention from engineers and researchers alike. However, there is a lack of information from the industry on the lifetime prediction of thin HDPE GMBs installed in the exposed environment particularly common to the shrimp aquaculture industry in South East Asia. Furthermore the properties of thin (0.75mm) HDPE GMBs are not covered by the industry standard of "GRI Test Method GM13" and needs to be extrapolated. This paper seeks to collate available information on the durability and lifetime prediction of GRI GM13 standard HDPE GMBs both in the exposed and buried environment and proposes a cautious extrapolation method in order to arrive at a reasonable lifetime prediction for the thinner gauge GMBs for the shrimp aquaculture industry.
Lifetime Prediction of Thin HDPE Geomembranes for the Shrimp Aquaculture Industry
Tan, Daniel (author) / Denis, Robert (author) / Elie, Guy (author) / Cao, David (author)
2013
10 Seiten, Bilder, Tabellen, Quellen
Conference paper
Storage medium
English
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