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Deterioration and damage evaluation of rendering mortars exposed to sulphuric acid

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Abstract

Renders and plasters are usually employed for restoration, consolidation and decorative purposes. This paper looks at a rapid method based on conductivity measurements to evaluate the damage caused by sulphuric acid on cement renders. Exposure of the renders to 0.1% w/w sulphuric acid solutions resulted, as expected, in the formation of gypsum and no signs of ettringite were observed. The samples were also treated with siloxane coatings (polydimethylsiloxane) to investigate the waterproofing role on acid protection. A linear correlation was found between the time of immersion and change in conductivity. Finally, the results were supported by water absorption tests, scanning electron microscopy, X-ray diffraction and ion chromatography.

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Acknowledgments

The authors express their thanks to SAIT the technological service of the Technical University of Cartagena. The support and recommendations given by Alberto Alcolea from SAIT are much appreciated. We are grateful for the technical information and the samples provided by Saint Gobain Weber Cermaksa, Wacker-Chemie, Brenntag Ibérica and Cemex España.

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Authors and Affiliations

  1. Departamento de Arquitectura y Tecnología de la Edificación, Escuela de Arquitectura e Ingeniería de la Edificación, Universidad Politécnica de Cartagena, Alfonso XIII 52, 30203, Cartagena, Spain

    Marcos Lanzón

  2. Grupo E047-01 QCBA, Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia, 30100, Espinardo, Murcia, Spain

    P. A. García-Ruiz

Authors
  1. Marcos Lanzón
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  2. P. A. García-Ruiz
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Correspondence to P. A. García-Ruiz.

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Lanzón, M., García-Ruiz, P.A. Deterioration and damage evaluation of rendering mortars exposed to sulphuric acid. Mater Struct 43, 417–427 (2010). https://doi.org/10.1617/s11527-009-9500-4

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  • DOI: https://doi.org/10.1617/s11527-009-9500-4

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