(1057)--Long-term performance of a HDPE建筑材料学建筑材料学.pdf

Geotextiles and Geomembranes 47 (2019) 815–830 Contentslistsavailableat ScienceDirect GeotextilesandGeomembranes journal homepage: /locate/geotexmem Long-termperformanceofaHDPEgeomembranestabilizedwithHALSin T chlorinatedwater☆ F.B.Abdelaal,M.S.Morsy,R.KerryRowe∗ GeoEngineeringCentreatQueens-RMC,QueensUniversity,Kingston,ON,Canada,K7L3N6 A R T I C L E I N FO A B S T R A C T Keywords A high density polyethylene geomembrane (GMB) stabilized with hindered amine (light) stabilizers (HALS or Geomembrane HAS) is immersed in four chlorinated water solutions with a simulated free chlorine concentration range of Chlorinatedwater 0.5–5ppmatfivedifferenttemperatures(25,40,65,75,and85°C)for70months.Standardandhighpressure HDPE oxidative induction time (OIT) tests are performed to monitor antioxidants depletion while melt flow index, HALS tensile,andstresscrackresistance(SCR)testsareconductedtomonitordegradationinphysicalandmechanical Stresscrackresistance Nominalfailure properties. Degradation in the GMB properties occurred shortly after immersion in chlorinated water at all Potablewaterreservoirs temperatures except at 25°C. Increasing the free chlorine concentration resulted in faster degradation of the tensilepropertiesandSCR.Thepredictedtimetonom