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Thirst Pavilion
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DESCRIPCION

The Water International Exhibition that took place in Saragossa during the summer of 2008 in the Ebro’s banks required the creation of buildings for housing the exhibition contents.
One of these buildings was the Thirst Pavilion, located in the Expo area named Thematic Plazas, which mission was expose the need of water by humankind and the consequences suffered by the environment for satisfying that need.
To reach that objective, it was considered as an enclosed building, a spherical segment of ø46 m in plan, having a height of 16 m, remembering a big morula, being externally composed its skin by a macro “porosity” reticule of reinforced fiberglass polyester sheets, being those “pores” filled by means of ETFE cushions. 
The Pavilion had 82 ETFE cushions, having diferent dimensions all of them. It could be said that they have circular section, varying their diameter between 2.8 and 9.8 m, but maintaining rate sag – diameter of 0.15 for each layer of the cushion.

Upper and lower layers of each cushion had a thickness of 200 µm, being the external transparent and silvered the inner one. Due to the silvered coating, the sun rays were reflected, providing to the Pavilion an appearance of a set of water drops. Inside the cushions, led diodes were installed for night illumination, blue and white were the colors selected.
The cushions had an internal pressure of 30 kp/m2, which allowed them resisting all the external actions without having slackening or high stresses in the cushions layers.
The initial intention was covering the Pavilion with a salt crust, and the cushions were provided with brine water vaporizers, but at last, during the Expo, the salt didn’t grip and the water vaporization was forgotten.
Nowadays the Pavilion has been dismantled and rebuilt in the city of Valladolid.

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Arenas & Asociados - 2012