Weathering of iron sulfides and concrete alteration: thermodynamic model and observation in dams from Central Pyrenees, Spain

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Title: Weathering of iron sulfides and concrete alteration: thermodynamic model and observation in dams from Central Pyrenees, Spain
Authors: Ayora Ibáñez, Carlos | Chinchón Yepes, Servando | Aguado de Cea, Antonio | Guirado Gispert, Francesc
Research Group/s: Materiales y Sistemas Constructivos de la Edificación
Center, Department or Service: Universidad de Alicante. Departamento de Construcciones Arquitectónicas | Instituto de Ciencias de la Tierra | Universidad Politécnica de Catalunya. Departamento de Ingeniería de la Construcción
Keywords: Chemical-equilibria | Ettringite | Gypsum
Knowledge Area: Construcciones Arquitectónicas
Issue Date: Sep-1998
Publisher: Elsevier
Citation: AYORA IBÁÑEZ, Carlos, et al. "Weathering of iron sulfides and concrete alteration: thermodynamic model and observation in dams from Central Pyrenees, Spain". Cement and Concrete Research. Vol. 28, Issue 9 (Sept. 1998). ISSN 0008-8846, pp. 1223-1235
Abstract: The concrete of the Graus and Tabescan dams present significant durability problems. The cement paste is altered to expansive phases such as ettringite and gypsum, following fractures and aggregate-paste interfaces. The alteration is initially attributed to the acidic solution produced by the weathering of the pyrrhotite contained in the aggregate fragments. A chemical model, based on ion association and thermodynamic equilibrium, permits the calculation of the mass transfer between the solids and the pore solution, and the prediction of the progress of the acidic attack. The results of the calculations have been compared with the alteration features observed in concrete of these dams. Despite the simplifications, this model is able to predict the observed alteration stages, and confirms the hypothesis of acidic-sulfatic alteration of the cement.
Description: This article was originally published in Cement and Concrete Research, Vol. 28, No. 4, pp. 591-603, with incorrect placement of figures. This version completely supersedes the previously published version, which should be disregarded.
URI: http://hdl.handle.net/10045/12322
ISSN: 0008-8846 (Print) | 1873-3948 (Online)
DOI: 10.1016/S0008-8846(98)00137-9
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/S0008-8846(98)00137-9
Appears in Collections:INV - MSCE - Artículos de Revistas
INV - ALISoft - Artículos de Revistas

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