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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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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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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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