Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation

Raphaele Malheiro, Aires Camões, Gibson Meira, Maria Teresa Amorim, João Castro-Gomes, Rui Miguel Ferreira

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Carbonation and chloride action are the two leading causes of degradation in reinforced concrete structures. Despite the combined action of these two mechanisms being a reality, there is little research on the effect of this combination in cementitious matrices. Furthermore, the incorporation of fly ash in cementitious matrices has 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 consumed by the pozzolanic reactions, which makes easier the carbonation front advance. Therefore, this paper presents a study of the behavior of cementitious matrices, with and without fly ash, subjected to the combined action of chlorides and carbonation. Two different kinds of mortars were produced: reference (only cement CEM I 42.5R) and fly ash mortar (40% replacement of cement). After curing, the specimens were subjected to three different wetting-drying cycles, considering NaCl solutions and CO2 atmospheres. Afterwards, chloride profiles and carbonation front were measured. Results show that carbonation has a direct influence on chloride penetration, decreasing it for cement mortars with 0% fly ash and increasing it for mortars with 40% cement replacement by fly ash. Moreover, the evolution of carbonation is also influenced by chloride presence, which decreases under the combined action.
Original languageEnglish
Article numbere-12162
JournalRevista Materia
Volume23
Issue number3
DOIs
Publication statusPublished - 18 Oct 2018
MoE publication typeNot Eligible

Fingerprint

Carbonation
Coal Ash
fly ash
Chlorides
Fly ash
chlorides
Ions
cements
Mortar
Cements
matrices
ions
concrete structures
curing
Concrete construction
drying
wetting
Reinforced concrete
Curing
Wetting

Keywords

  • Carbonation
  • Chloride
  • Fly ash
  • Mortar
  • Wetting-drying cycles

Cite this

Malheiro, Raphaele ; Camões, Aires ; Meira, Gibson ; Amorim, Maria Teresa ; Castro-Gomes, João ; Ferreira, Rui Miguel. / Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation. In: Revista Materia. 2018 ; Vol. 23, No. 3.
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abstract = "Carbonation and chloride action are the two leading causes of degradation in reinforced concrete structures. Despite the combined action of these two mechanisms being a reality, there is little research on the effect of this combination in cementitious matrices. Furthermore, the incorporation of fly ash in cementitious matrices has 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 consumed by the pozzolanic reactions, which makes easier the carbonation front advance. Therefore, this paper presents a study of the behavior of cementitious matrices, with and without fly ash, subjected to the combined action of chlorides and carbonation. Two different kinds of mortars were produced: reference (only cement CEM I 42.5R) and fly ash mortar (40{\%} replacement of cement). After curing, the specimens were subjected to three different wetting-drying cycles, considering NaCl solutions and CO2 atmospheres. Afterwards, chloride profiles and carbonation front were measured. Results show that carbonation has a direct influence on chloride penetration, decreasing it for cement mortars with 0{\%} fly ash and increasing it for mortars with 40{\%} cement replacement by fly ash. Moreover, the evolution of carbonation is also influenced by chloride presence, which decreases under the combined action.",
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Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation. / Malheiro, Raphaele; Camões, Aires; Meira, Gibson; Amorim, Maria Teresa; Castro-Gomes, João; Ferreira, Rui Miguel.

In: Revista Materia, Vol. 23, No. 3, e-12162, 18.10.2018.

Research output: Contribution to journalArticleScientificpeer-review

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