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    Effect of Carbonation on the Chloride Diffusion of Mortar Specimens Exposed to Cyclic Wetting and Drying

    TitleEffect of Carbonation on the Chloride Diffusion of Mortar Specimens Exposed to Cyclic Wetting and Drying
    Publication TypeCommunications in International Conferences
    Year of Publication2014
    AuthorsMalheiro R., Camões A., Ferreira R. M., Meira G., and Amorim M. T.
    Abstract

    Carbonation and chloride ingress are the two main causes of corrosion in reinforced concrete structures. Despite the combined action of these mechanisms being a reality, there is little research on the effect of carbonation on the chloride diffusion in concrete. This work intends to study the influence of carbonation on chloride diffusion of mortar specimens. Cubic mortar specimens were cast with 0.55 of water-cement ratio. After curing, the specimens were subjected to 56 days of wetting and drying cycles. Half the samples were immersed for a day in a 3.5% NaCl solution and then placed for 6 days in a carbonation chamber (4%CO2); the other half were also kept a day in 3.5% NaCl, but after were kept during 6 days in laboratory environment. Afterwards, the depth of chlorides and CO2 penetration was evaluated. Complementary tests were also carried out, such as rapid chloride migration coefficient and water capillary absorption. The results show that carbonation has a direct influence on chloride penetration, decreasing it. The noncarbonated samples showed a profile with higher amount of chloride than carbonated ones. This fact can be related to the refinement of the mortar pores caused by carbonation and observed in water absorption tests.

    Conference NameXIII DBMC, International Conference on Durability of Building Materials and Components
    Pagination482-489
    Date Published2014-09-02
    Conference LocationSão Paulo, Brazil
    Keywordsaccelerated testing, Carbonation, chloride, combined degradation, Deterioration, Mortar
    RightsopenAccess
    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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