Analysis of alterations presented in a white-concrete façade exposed to a marine environment——A case study in Cádiz (Spain)

V. Flores-Alés; F.J. Alejandre; F.J. Blasco-López; M. Torres-González; J.M. Alducin-Ochoa; V. Flores-Alés; F.J. Alejandre; F.J. Blasco-López; M. Torres-González; J.M. Alducin-Ochoa

doi:10.3934/matersci.2022015

AIMS Materials Science

2022, Volume 9, Issue 2: 255-269. doi: 10.3934/matersci.2022015

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Research article

Analysis of alterations presented in a white-concrete façade exposed to a marine environment——A case study in Cádiz (Spain)

1.
Department of Architectural Construction Ⅱ, University of Seville, Seville, Spain
2.
Department of Civil Engineering, Architecture and Georesources, CERIS, Instituto Superior Técnico-University of Lisbon, Portugal

Received: 24 November 2021 Revised: 09 February 2022 Accepted: 17 February 2022 Published: 23 February 2022

This study analyses the façades of a white concrete building located in Cádiz (Spain). Numerous sections of the concrete cladding on the façades have become detached and there are clear signs of reinforcement corrosion. For the purposes of this study, the arrangement of the reinforcement was evaluated by georadar (GPR). Cylindrical concrete cores measuring 10 cm in diameter by 15–18 cm in depth were extracted and their carbonation front was evaluated. Samples were characterized by physical properties determination; chemical and mineralogical analysis and the chloride penetration profiles.

According to the results obtained, the concrete used can be considered permeable and porous (16.5–19.7%). Only two sampling points fulfilled the minimum reinforcement coating requirements for this type of environmental exposure, in accordance with current Spanish legislation. The carbonation fronts have reached the reinforcements, causing their depassivation. Depending on the orientation of the façade, the penetration of chlorides from marine spray was observed with a maximum value of 0.250% by weight of cement, without reaching the limit states of durability.
- concrete,
- marine spray,
- carbonation,
- depassivation,
- chlorides
Citation: V. Flores-Alés, F.J. Alejandre, F.J. Blasco-López, M. Torres-González, J.M. Alducin-Ochoa. Analysis of alterations presented in a white-concrete façade exposed to a marine environment——A case study in Cádiz (Spain)[J]. AIMS Materials Science, 2022, 9(2): 255-269. doi: 10.3934/matersci.2022015

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Abstract

This study analyses the façades of a white concrete building located in Cádiz (Spain). Numerous sections of the concrete cladding on the façades have become detached and there are clear signs of reinforcement corrosion. For the purposes of this study, the arrangement of the reinforcement was evaluated by georadar (GPR). Cylindrical concrete cores measuring 10 cm in diameter by 15–18 cm in depth were extracted and their carbonation front was evaluated. Samples were characterized by physical properties determination; chemical and mineralogical analysis and the chloride penetration profiles.

According to the results obtained, the concrete used can be considered permeable and porous (16.5–19.7%). Only two sampling points fulfilled the minimum reinforcement coating requirements for this type of environmental exposure, in accordance with current Spanish legislation. The carbonation fronts have reached the reinforcements, causing their depassivation. Depending on the orientation of the façade, the penetration of chlorides from marine spray was observed with a maximum value of 0.250% by weight of cement, without reaching the limit states of durability.

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