Assessment methodology for conservation planning of concrete buildings: ocean swimming pool (1960-2021) by Alvaro Siza in Portugal

Abstract

The paper intends to provide a building assessment methodology for the conservation planning of concrete buildings, presenting the demonstrative case-study of the Ocean Swimming Pool (design 1960-1966; conservation 2018-2021) conceived by the Pritzker Prize alvaro Siza, in Portugal. The building is a landmark of 20(th) century architecture in the national and international context, being listed as National Monument and included in the World Heritage Tentative List. The article will focus particularly on the building assessment methodology, supported by the cross-analysis of the 'documentary evidence' and 'physical evidence', allowing for an integrated approach for conservation planning. The paper includes documentation on the building chronology and construction, as well as on the inspection and diagnosis using both non-destructive and minor destructive testing. Moreover, the article presents a pilot demonstration of concrete repair supported on the building knowledge and diagnosis. This real case study shows the advantages of integrating conservation criteria and methods used for traditional buildings to modern heritage in concrete (going beyond the common visible patch repair), in which there are still few case-studies illustrating good practices. This holistic approach has also contributed to the development of detailed policies for risk assessment, concrete conservation and maintenance in the framework of the Conservation Plan.