MATEC Web Conf.
Volume 199, 2018International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR 2018)
|Number of page(s)||7|
|Section||Concrete Deteriorating Mechanisms and Prediction of Durability|
|Published online||31 October 2018|
Leaching, carbonation and chloride ingress in reinforced alkali-activated fly ash mortars
Bundesanstalt für Materialforschung und -prüfung (BAM), 7.4 Technology of Construction Materials, 12205 Berlin, Germany
2 Bundesanstalt für Materialforschung und -prüfung (BAM), 7.6 Corrosion and Corrosion Protection, 12205 Berlin, Germany
* Corresponding author: firstname.lastname@example.org
Alkali-activated fly ash mortars were studied with regard to durability-relevant transport coefficients and the electrochemical behaviour of embedded carbon steel bars on exposure of the mortars to leaching, carbonation and chloride penetration environments. The transport coefficients differed considerably between different formulations, being lowest for a mortar with BFS addition, but still acceptable for one of the purely fly ash-based mortars. Leaching over a period of ~300 days in de-ionized water did not lead to observable corrosion of the embedded steel, as shown by the electrochemical data and visual inspection of the steel. Exposure to 100 % CO2 atmosphere caused steel depassivation within approx. two weeks; in addition, indications of a deterioration of the mortar were observed. The results are discussed in the context of the different reaction products expected in highand low-Ca alkali-activated binders, and the alterations caused by leaching and carbonation.
© The Authors, published by EDP Sciences, 2018
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