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    Carbonation Front Progress in Mortars Containing Fly Ash Considering the Presence of Chloride Ions

    TitleCarbonation Front Progress in Mortars Containing Fly Ash Considering the Presence of Chloride Ions
    Publication TypePapers in International Journals
    Year of Publication2014
    AuthorsMalheiro R., Camões A., Meira G., Ferreira R. M., Amorim M. T., and Reis R. J. C.
    Abstract

    The incorporation of fly ash (FA) in cementitious matrices have been frequently used in order to make the matrix more resistant to the action of chlorides. On the other hand, it is known that Ca (OH)2 existing in the matrix is partially consumed by the pozzolanic reactions, which facilitates the advancement of carbonation. Given that the combined action between carbonation and chloride penetration is a fact little known, we speculate about the behaviour of the matrix in this context. This study investigates the influence of the presence of chlorides on the carbonation in mortars with FA. Samples with 0% and 40% replacement of cement CEM I 42.5 R for FA were molded with water/binder 0.56 and 0.52 respectively. After 90 days of curing the specimens were subjected to cycles of immersion/drying for 56 days. Half of the samples was subjected to the following cycle: two days in a solution containing NaCl (concentration equal to 3.5 %); 12 days in the carbonation chamber (4% of CO2). The other half was: two days in water; 12 days in the carbonation chamber. Then, the development of carbonation was evaluated. The results indicate that the presence of chlorides influences the carbonation. The specimens submitted to the exclusive action of CO2 showed a greater depth of carbonation compared to that presented by the specimens subjected to combined action. This may be related to changes in properties of the matrix which may lead to further refinement of the pores and related to the presence of the salt that can lead to partial filling of the pores and the increase in moisture content.

    JournalKey Engineering Materials
    VolumeVolume 634
    EditionTrans Tech Publications Ltd, Switzerland
    Pagination214-221
    Date Published2014-12-11
    PublisherTrans Tech Publications Ltd
    ISSN1662-9795
    DOI10.4028/www.scientific.net/KEM.634.214
    URLhttp://www.scientific.net/KEM.634.214
    KeywordsCarbonation, chloride, diffusion, Durability, Fly ash, Interaction, permeability
    RightsrestrictedAccess
    Peer reviewedyes
    Statuspublished
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    About CTAC

    The Centre for Territory, Environment and Construction (CTAC) is a research unit of the School of Engineering of University of Minho (UMinho), recognised by the “FCT – Fundação para a Ciência e Tecnologia” (Foundation for Science and Technology), associated to the Department of Civil Engineering (DEC), with whom it shares resources and namely human resources.

    Currently CTAC aggregates 25 researchers holding a PhD of which 20 are faculty professors of the Civil Engineering Department. Read more


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    Centro de Território, Ambiente e Construção
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    4800-058 Guimarães, Portugal

    Phone: + 351 253 510 200 (517 206)
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