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Sulphatic attack in concrete structures in cold mountainous zones / A. Pavoine in European journal of environmental and civil engineering, Vol. 16 N° 5 (Mai 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 5 (Mai 2012) . - pp. 625-634 Titre : Sulphatic attack in concrete structures in cold mountainous zones Type de document : texte imprimé Auteurs : A. Pavoine, Auteur ; L. Divet, Auteur ; E. Premat, Auteur Année de publication : 2012 Article en page(s) : pp. 625-634 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete  Pathology  Sulphates  Expansion  Ettringite  Thaumasite Résumé : In 2006, experiments were conducted on 90 concrete ski lift foundation elements. The concrete was contaminated with sulphates whose content by mass varied between 0.9% and 14%. The concrete was manufactured with type CEM I cement, limestone (calcium carbonate and dolomite) and siliceous aggregates with highly variable proportions of anhydrite. There was a considerable danger that the thaumasite form of sulphate attack would occur in these concretes because of their exposure to low temperatures (T <15°C). Tests were conducted on core samples taken from the structures to provoke the formation of thaumasite (immersion at 5°C) or ettringite (immersion at 20°C). After 900 days of monitoring, some concretes exhibited particularly severe deterioration. Conservation at low temperature led to severe swelling, failure and a marked loss of cohesion in some concretes with a high sulphate content (SO3 > 7% by weight). Development of the disorder is not only related to the total sulphate content. Factors that could not be characterised, such as the distribution and size of the anhydrite particles must also be taken into account. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668019 [article] Sulphatic attack in concrete structures in cold mountainous zones [texte imprimé] / A. Pavoine, Auteur ; L. Divet, Auteur ; E. Premat, Auteur . - 2012 . - pp. 625-634. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 5 (Mai 2012) . - pp. 625-634 Mots-clés : Concrete  Pathology  Sulphates  Expansion  Ettringite  Thaumasite Résumé : In 2006, experiments were conducted on 90 concrete ski lift foundation elements. The concrete was contaminated with sulphates whose content by mass varied between 0.9% and 14%. The concrete was manufactured with type CEM I cement, limestone (calcium carbonate and dolomite) and siliceous aggregates with highly variable proportions of anhydrite. There was a considerable danger that the thaumasite form of sulphate attack would occur in these concretes because of their exposure to low temperatures (T <15°C). Tests were conducted on core samples taken from the structures to provoke the formation of thaumasite (immersion at 5°C) or ettringite (immersion at 20°C). After 900 days of monitoring, some concretes exhibited particularly severe deterioration. Conservation at low temperature led to severe swelling, failure and a marked loss of cohesion in some concretes with a high sulphate content (SO3 > 7% by weight). Development of the disorder is not only related to the total sulphate content. Factors that could not be characterised, such as the distribution and size of the anhydrite particles must also be taken into account. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668019