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External sulfate attack in dam concretes with thaumasite formation
Chinchón Payá, S.; Aguado de Cea, Antonio; Nugteren, H. W; Chinchón Yepes, Jose Servando
Universitat Politècnica de Catalunya. Departament d'Enginyeria de la Construcció; Universitat Politècnica de Catalunya. TE - Tecnologia d'Estructures
Concrete core samples extracted from different areas of the Mequinenza Dam (Spain) have been studied and expansive reactions affecting the structure were not found. However, expansive reactions in the concrete of certain parts located near the abutments of two galleries have been observed as a consequence of an external sulfate attack due to the sulfur compounds contained in the lignites that are present on the surrounding terrain. Secondary gypsum, ettringite, and thaumasite, as well as several sulfate efflorescence have been detected. The thaumasite formed in the degraded concrete is related to a Thaumasite Sulfate Attack (TSA). Scanning Electron Microscopy (SEM) and Rietveld analyses of the TSA samples would show that thaumasite could have been formed thanks to ettringite acting as nuclei or by a direct precipitation from solutions within the pores of the cement matrix.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
Thaumasite
Concrete dams
Mequinenza (Spain)
Concrete dam
Sulfate attack
Thaumasite
DELAYED ETTRINGITE FORMATION
GYPSUM FORMATION
CEMENT MORTARS
IRON SULFIDES
DETERIORATION
PERFORMANCE
OXIDATION
SYSTEM
MODEL
Sulfats
Preses de formigó
Mequinensa (Catalunya : Pantà)
Attribution-NonCommercial 3.0 Spain
http://creativecommons.org/licenses/by-nc/3.0/es/
info:eu-repo/semantics/publishedVersion
Artículo
Instituto Técnico de la Construcción y del Cemento
         

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