Carbonation front progress in mortars containing fly ash considering the presence of chloride ions

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

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

    3 Citations (Scopus)

    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.
    Original languageEnglish
    Title of host publicationSustainable Construction Materials
    EditorsJosé Aguiar, Aires Camões, Raul Fangueiro, Rute Eires, Sandra Cunha, Mohammad Kheradmand
    Pages214-221
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA4 Article in a conference publication

    Publication series

    SeriesKey Engineering Materials
    Volume634
    ISSN1013-9826

    Fingerprint

    mortar
    fly ash
    chloride
    matrix
    ion
    moisture content
    cement
    penetration
    replacement
    salt
    water

    Keywords

    • carbonation
    • chloride
    • fly ash
    • durability
    • interaction
    • diffusion
    • permability

    Cite this

    Malheiro, R., Camoes, A., Ferreira, M., Meira, G., Amorim, T., & Reis, R. (2015). Carbonation front progress in mortars containing fly ash considering the presence of chloride ions. In J. Aguiar, A. Camões, R. Fangueiro, R. Eires, S. Cunha, & M. Kheradmand (Eds.), Sustainable Construction Materials (pp. 214-221). Key Engineering Materials, Vol.. 634 https://doi.org/10.4028/www.scientific.net/KEM.634.214
    Malheiro, R. ; Camoes, A. ; Ferreira, Miguel ; Meira, G. ; Amorim, T. ; Reis, R. / Carbonation front progress in mortars containing fly ash considering the presence of chloride ions. Sustainable Construction Materials. editor / José Aguiar ; Aires Camões ; Raul Fangueiro ; Rute Eires ; Sandra Cunha ; Mohammad Kheradmand. 2015. pp. 214-221 (Key Engineering Materials, Vol. 634).
    @inproceedings{7062ef45591644e79373be7f49073904,
    title = "Carbonation front progress in mortars containing fly ash considering the presence of chloride ions",
    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.",
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    author = "R. Malheiro and A. Camoes and Miguel Ferreira and G. Meira and T. Amorim and R. Reis",
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    Malheiro, R, Camoes, A, Ferreira, M, Meira, G, Amorim, T & Reis, R 2015, Carbonation front progress in mortars containing fly ash considering the presence of chloride ions. in J Aguiar, A Camões, R Fangueiro, R Eires, S Cunha & M Kheradmand (eds), Sustainable Construction Materials. Key Engineering Materials, vol. 634, pp. 214-221. https://doi.org/10.4028/www.scientific.net/KEM.634.214

    Carbonation front progress in mortars containing fly ash considering the presence of chloride ions. / Malheiro, R.; Camoes, A.; Ferreira, Miguel; Meira, G.; Amorim, T.; Reis, R.

    Sustainable Construction Materials. ed. / José Aguiar; Aires Camões; Raul Fangueiro; Rute Eires; Sandra Cunha; Mohammad Kheradmand. 2015. p. 214-221 (Key Engineering Materials, Vol. 634).

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

    TY - GEN

    T1 - Carbonation front progress in mortars containing fly ash considering the presence of chloride ions

    AU - Malheiro, R.

    AU - Camoes, A.

    AU - Ferreira, Miguel

    AU - Meira, G.

    AU - Amorim, T.

    AU - Reis, R.

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    N2 - 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.

    AB - 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.

    KW - carbonation

    KW - chloride

    KW - fly ash

    KW - durability

    KW - interaction

    KW - diffusion

    KW - permability

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    M3 - Conference article in proceedings

    SN - 978-3-03835-351-5

    T3 - Key Engineering Materials

    SP - 214

    EP - 221

    BT - Sustainable Construction Materials

    A2 - Aguiar, José

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    A2 - Fangueiro, Raul

    A2 - Eires, Rute

    A2 - Cunha, Sandra

    A2 - Kheradmand, Mohammad

    ER -

    Malheiro R, Camoes A, Ferreira M, Meira G, Amorim T, Reis R. Carbonation front progress in mortars containing fly ash considering the presence of chloride ions. In Aguiar J, Camões A, Fangueiro R, Eires R, Cunha S, Kheradmand M, editors, Sustainable Construction Materials. 2015. p. 214-221. (Key Engineering Materials, Vol. 634). https://doi.org/10.4028/www.scientific.net/KEM.634.214