Avaliação de camadas de proteção para geomembranas de PVC e PEAD / Assessment of the performance of protective layers for PVC and HDPE geomembranes

AUTOR(ES)

Karla Maria Wingler Rebelo

DATA DE PUBLICAÇÃO

2009

RESUMO

The performance of non-woven geotextiles and soils as protection elements of polyvinyl chloride (PVC) and high density polyethylene (HDPE) geomembranes is studied. The materials used comprised PVC geomembranes of 1,0 and 2,0 mm thickness and HDPE geomembranes of 1,5 and 2,0 mm thickness while the protective layers were of non-woven polyester (PET) geotextiles with mass per unit area of 130, 300, 400 e 600 g/M POT.2and polypropylene (PP) with mass per unit area of 400 e 600 g/M POT.2. It was also used protective layers made of a fine to medium sand and a typical clayey sand of central area of the State of São Paulo. The study was based on an experimental landfill built to simulate the damage associated to construction procedures and on index and performance laboratory tests. Through qualitative and quantitative analysis of damaged geomembranes, the behavior of each protective element was evaluated. Index laboratory test results have shown that the geotextile is able to increase the geomembrane puncture strength and that the strength increase is related to the tensile strength of geotextile and geomembrane. For similar geotextiles, the larger increase in puncture strength was observed for the geomembrane that presented the lower tensile strength. Visual observation of field tests has shown that the introduction of protective layers reduces the mechanical damage; however some physical and performance properties of geomembrane have changed. It was also observed that the performance of geotextiles in the experimental landfill does not depend on the tensile strength, as observed in laboratory index tests. Test results also suggest that field damage associated to the landfill construction are more intense than that observed in laboratory tests such as the dynamic puncture test.

ASSUNTO(S)

laboratory tests ensaios de campo geomembranas geomembranes geotêxteis mechanical damage geotextiles protective layers camadas de proteção field tests danos mecânicos ensaios de laboratório

Documentos Relacionados

• Desempenho de camadas de proteção para geomembranas
• Aspectos de degradação de geomembranas poliméricas de polietileno de alta densidade (PEAD) e de poli (cloreto de vinila) (PVC)
• DURABILITY OF HDPE GEOMEMBRANES: AN OVERVIEW
• Interface strength between geomembranes and soils by ring shear test
• Estudo de camadas dielétricas para aplicação em capacitores MOS.