The use of High Density Polyethylene (HDPE) lining in seepage
prevention in dams was identified to reduce the cost of water
storage. To make it acceptable to end users, it is necessary to
determine its lifespan when exposed to tropical climates using
viscoelastic models. The Findley Power Law was used to build a
model for prediction of the material behaviour at elevated
temperature in both short term and long term applications.
Time-Temperature Superposition (TTSP) was also used to develop
master curves for prediction of long term properties. Micrographs
were presented to track the changes during the aging process under
different conditions. A simple model was developed for estimation
of the service life of the HDPE lining that only requires
determination of maximum strain at a given temperature. It was
further concluded that the welded joint was the most serious factor
undermining the service life of the lining material under tensile
creep and that alternating temperature had a more damaging effect
on the lining material than elevated temperature hence the lining
is likely to suffer more damage in the tropics than in other
climates.
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