Effect of carbonation on the chloride diffusion of mortar specimens exposed to cyclic wetting and drying

R. Malheiro, A. Camoes, Miguel Ferreira, T. Amorim, G. Meira

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    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.
    Original languageEnglish
    Title of host publication13th Internatinal Conference on Building Materials and Components, XIII DBMC
    Subtitle of host publicationProceedings
    Pages482-489
    Publication statusPublished - 2014
    MoE publication typeA4 Article in a conference publication
    Event13th Internatinal Conference on Building Materials and Components, XIII DBMC - Sao Paulo, Brazil
    Duration: 2 Sep 20145 Sep 2014
    Conference number: 13

    Conference

    Conference13th Internatinal Conference on Building Materials and Components, XIII DBMC
    Abbreviated titleXIII DBMC
    CountryBrazil
    CitySao Paulo
    Period2/09/145/09/14

    Fingerprint

    Carbonation
    Mortar
    Wetting
    Drying
    Water absorption
    Concrete construction
    Reinforced concrete
    Curing
    Water
    Cements
    Concretes
    Corrosion

    Keywords

    • chloride
    • carbonation
    • mortar
    • deterioration
    • combined degradation
    • accelerated testing

    Cite this

    Malheiro, R., Camoes, A., Ferreira, M., Amorim, T., & Meira, G. (2014). Effect of carbonation on the chloride diffusion of mortar specimens exposed to cyclic wetting and drying. In 13th Internatinal Conference on Building Materials and Components, XIII DBMC: Proceedings (pp. 482-489)
    Malheiro, R. ; Camoes, A. ; Ferreira, Miguel ; Amorim, T. ; Meira, G. / Effect of carbonation on the chloride diffusion of mortar specimens exposed to cyclic wetting and drying. 13th Internatinal Conference on Building Materials and Components, XIII DBMC: Proceedings. 2014. pp. 482-489
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    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.",
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    Malheiro, R, Camoes, A, Ferreira, M, Amorim, T & Meira, G 2014, Effect of carbonation on the chloride diffusion of mortar specimens exposed to cyclic wetting and drying. in 13th Internatinal Conference on Building Materials and Components, XIII DBMC: Proceedings. pp. 482-489, 13th Internatinal Conference on Building Materials and Components, XIII DBMC, Sao Paulo, Brazil, 2/09/14.

    Effect of carbonation on the chloride diffusion of mortar specimens exposed to cyclic wetting and drying. / Malheiro, R.; Camoes, A.; Ferreira, Miguel; Amorim, T.; Meira, G.

    13th Internatinal Conference on Building Materials and Components, XIII DBMC: Proceedings. 2014. p. 482-489.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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    AU - Camoes, A.

    AU - Ferreira, Miguel

    AU - Amorim, T.

    AU - Meira, G.

    PY - 2014

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    AB - 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.

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    KW - accelerated testing

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    Malheiro R, Camoes A, Ferreira M, Amorim T, Meira G. Effect of carbonation on the chloride diffusion of mortar specimens exposed to cyclic wetting and drying. In 13th Internatinal Conference on Building Materials and Components, XIII DBMC: Proceedings. 2014. p. 482-489