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Margineda bridge (Andorra): characterization of materials and determination of intervention criteria
Ramírez Casas, Judith; Navarro Ezquerra, Antonia; Rosell Amigó, Juan Ramón
Universitat Politècnica de Catalunya. Departament de Construccions Arquitectòniques II
Pont de la Margineda (Margineda Bridge) is a Romanic bridge located along the ancientRoyal Road that connects St. Julià de Lòira and Andorra la Vella. It is one of the biggest andmost slender Medieval Bridges still standing in the Andorra Principality. In ancient times, itwas used to cross the river Valira. Margineda Bridge measures approximately 50 meters,and has a semicircular arch.The technical quality of the construction (rubble masonry with mortar joints) is evident fromthe bridge’s good state of conservation and its high level of integrity throughout its lifespan; ithas not experienced any major transformations.The government of the Principality is promoting a comprehensive study of the bridge from ahistorical, archaeological, and technical-construction standpoint in order to design arestoration project. As part of the project’s multidisciplinary group, the Materials Lab at theUniversitat Politècnica de Catalunya (UPC) had the objective of establishing interventioncriteria that would design a plan for the interventions to be implemented. The Lab hasperformed a study of the materials and damage to the bridge, following an analysismethodology and the subsequent assessment of the data obtained as a result.To study the materials, the lab has performed petrologic characterizations of the travertinevoussoirs on the edges and the rest of the stones in the masonry, mortar characterizationsfor identifying their composition, wall readings for determining the bridge’s differentconstruction stages and later interventions.Analyses of patina samples have also been performed in order to establish, on one hand,damage due to pollution and, on the other hand, the kind of biological agents that haveaffected its stones as well as mortar.The complete analysis of the material, obtained from calcinations of different types oftravertine stones extracted from different quarries, has enabled us to establish whether thelime used in mortars could have been obtained from the travertine marbles in thesurrounding area. Finally, as a result of the studies conducted, specific mortars have beendesigned for every particular need in the restoration process
Àrees temàtiques de la UPC::Edificació::Tècniques i sistemes constructius
Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials
Building materials
Materials -- Deterioració
Ponts -- Reforçament i reparació
Restricted access - publisher's policy
Conference Object
Escuela Universitaria de Arquitectura Técnica . Universidad Politécnica de Madrid

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