Evaluation of Mechanical and Thermal Properties after Chemical Degradation of PVC and HDPE Geomembranes

 

Paulo César Lodi

Associate Professor, PhD; Department of Civil Engineering, UNESP – São Paulo State University, Av. Eng. Luiz Edmundo C. Coube 14-01, 17.033-360, Bauru (SP), Brazil; e-mail: plodi@feb.unesp.br

Benedito de Souza Bueno

Full Professor, PhD; Department of Geotechnical Engineering, São Carlos School of Engineering, University of São Paulo (USP), Avenida do Trabalhador Sancarlense 400, 13.566-590, São Carlos (SP), Brazil; e-mail: bsbueno@sc.usp.br

Jorge Hamada

Full professor, PhD; Department of Civil Engineering, UNESP – São Paulo State University, Av. Eng. Luiz Edmundo C. Coube 14-01, 17.033-360, Bauru (SP), Brazil; e-mail: joha@feb.unesp.br

Eduardo Luis de Oliveira

Associate Professor, PhD; Department of Civil Engineering, UNESP – São Paulo State University, Av. Eng. Luiz Edmundo C. Coube 14-01, 17.033-360, Bauru (SP), Brazil; e-mail: eduoliv@feb.unesp.br

 

 ABSTRACT

Chemical compatibility between geomembranes and site-specific waste liquids should be assessed since the waste liquids are highly complex mixtures. This paper presents some considerations about the chemical compatibility of geomembranes and some results of mechanical tests in HDPE and PVC geomembranes that were exposed to leachate and chemical residue (niobium). PVC and HDPE geomembranes of two thicknesses were tested: 1.0, 2.0 mm (PVC) and 0.8, 2.5 mm (HDPE). The results obtained show that after exposure the PVC geomembranes (1.0, 2.0 mm) were more rigid and stiffer than fresh samples. The HDPE geomembranes, on the other hand, when exposed to leachate and niobium residue presented increases in deformation. Melt flow index (MFI) tests were also carried out to verify the oxidation.

Keywords: PVC and HDPE Geomembranes, Chemical degradation, Mechanical and Thermal tests.

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