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Título

Behaviour of four repair materials under accelerated testing of carbonation and chloride penetration

AutorAndrade Perdrix, Carmen CSIC ORCID ; Dogan, Unal Anil; Rebolledo, Nuria CSIC ORCID; Martínez Sierra, Isabel
Palabras claveRepair materials
Carbonation
Chloride
Corrosion
Fecha de publicación11-may-2008
Citación11th International Conference on Durability of Building Materials and Components (2008)
ResumenThe main objective of repair mortars, usually applied in patching is to restore the geometry and integrity of the material and the repassivate the reinforcing steel. Repair materials can be of two different natures: cement based or polymer based. In the case of cementitious repair materials, a polymer may be added that will dissolve or disperse during mixing. With any of these alternatives the steel should exhibit after repair a very low corrosion rate which is described as “be repassivated”. An additional property appreciated in repair mortars is their resistance to the penetration of the aggressive substances: carbonation and chloride ions. In present paper, four different repair materials are tested in an accelerated manner in order to rank them for application in a particular structure. The tests performed have been water absorption, mercury porosimetry, corrosion potential and corrosion rate after carbonation and after chloride penetration. The accelerated carbonation was made in a chamber at 100% CO2 and the accelerated chloride ingress by applying an electrical field. The results indicate very different performance regarding corrosion of the steel: While one of the mortars exhibited immediate corrosion depassivation when tested, there is another not depassivated after one year in the same conditions. These different behaviours claim for the need to test these materials. In the paper attempts are made to justify the very different performance from the results obtained on the microstructure.
DescripciónTrabajo presentado en la 11th International Conference on Durability of Building Materials and Components - Globality and Locality in Durability, celebrada en Estambul (Turquía) del 11 al 14 de mayo de 2008
URIhttp://hdl.handle.net/10261/233665
Identificadoresisbn: 978-975-561-325-3
Aparece en las colecciones: (IETCC) Comunicaciones congresos




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