Central Laboratory of Structures and Materials

and Agriculture, Spain

Central Laboratory of Structures and Materials

and Agriculture, Spain

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Noval A.M.,Central Laboratory of Structures and Materials | Blanco M.,Central Laboratory of Structures and Materials | Farcas F.,Ifsttar | Aguiar E.,Santa Cruz de Tenerife | And 2 more authors.
Geosynthetics International | Year: 2014

El Boquerón reservoir (Canary Islands, northern hemisphere) is waterproofed with an ethylene-propylene-diene terpolymer (EPDM) geomembrane (GM). To evaluate the durability of EPDM GMs in hydraulic applications, the characteristics of the EPDM GM (resin and additives) installed in the El Boquerón reservoir were followed for over 21 years. The results of this study are presented herein and show that, based on measurements of specimens from the north and south slopes of the reservoir, the orientation of the GM influences its ageing, with the north slope in the coronation or crest area ageing the most rapidly. Over the years, the El Boquerón EPDM GM oxidised, which may be the main cause of crosslinking in the EPDM. In turn, crosslinking could be the mechanism behind some of changes observed in the EPDM GM characteristics over time. In addition, some of the mechanical characteristics of the EPDM GM were influenced by the additives in the formulation; in particular, the loss and oxidation of paraffinic oils. However, despite the age-induced evolution of the mechanical and physicochemical characteristics of the GM, the El Boquerón EPDM GM, after 21 years of exposure, still satisfies the minimum requirements established by French standards for virgin GMs. © 2014 Thomas Telford Ltd.


Blanco M.,Central Laboratory of Structures and Materials | Castillo F.,Central Laboratory of Structures and Materials | Touze-Foltz N.,IRSTEA | Amat B.,Firestone Building Products | Aguiar E.,BALTEN
International Journal of GEOMATE | Year: 2015

The purpose of this study is to evaluate the durability of an EPDM geomembrane installed 18 years ago in the water reservoir of El Boquerón (Canary Islands, Spain). To do so, samples were regularly taken from different places of the water reservoir. Samples were laboratory tested as follows: foldability at low temperature, static and dynamic puncture resistance, Shore-A hardness, tensile strength and elongation at break, seam strength and microscopic techniques. The obtained results confirm the EPDM geomembrane is still in good condition. © 2015, International Journal of GEOMATE.

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