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TitleInteraction of carbonation and chloride ions ingress in concrete
Other titlesEffect of coupled deterioration by chloride and carbonation on chloride ions transport in concrete
Author(s)Malheiro, Raphaele Lira Meireles Castro
Camões, Aires
Meira, Gibson
Amorim, M. T. Pessoa de
Gomes, J. P. Castro
KeywordsChloride transport
Coupled deterioration
Accelerated test
Issue dateSep-2020
JournalRILEM Technical Letters
CitationMalheiro R., Camões A., Meira G., Amorim M. T., Castro-Gomes J. P. Effect of coupled deterioration by chloride and carbonation on chloride ions transport in concrete, RILEM Technical Letters, Vol. 50, pp. 56-62, doi:10.21809/rilemtechlett.2020.126, 2020
Abstract(s)Carbonation is one of the factors that can influence the chlorides transport. Despite the combined action of chlorides and carbonation being a reality, there is no consensus on the effect of this coupled deterioration on chloride transport. Accelerated tests were used to simulate this environment. Concrete specimens were cast using 0.60 water/cement ratio and CEM I 42.5R. After curing, half of specimens was submitted to accelerated carbonation test (20ºC, 55% RH and 4% CO2) during 1 and 7 months. The other half was protected with plastic film during the same period. Then, the specimens were submitted to the accelerated chlorides attack using: migration test and immersion test. Finished the immersion test, powder samples were extracted from surface to bulk and analysed to obtain free and total chloride profiles and pH profile. According to migration test results, the carbonation increases chloride transport regardless the test period. According to the immersion test results, there is a decrease in chloride ions transport when the specimens are carbonated for 1 month and a noticeable increase when carbonation period increases to 7 months. The redistribution of pores in carbonated concrete and the difficulty of chlorides binding in carbonated concrete are related to these results.
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Appears in Collections:C-TAC - Artigos em Revistas Internacionais

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