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Article

Comparison of Testing Methods for Evaluating the Resistance of Alkali-Activated Blast Furnace Slag Systems to Sulfur Dioxide

1
Faculty of Chemistry, Brno University of Technology, 61200 Brno, Czech Republic
2
Faculty of Civil Engineering, Brno University of Technology, 60200 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Rui Miguel Novais
Materials 2022, 15(4), 1344; https://doi.org/10.3390/ma15041344
Received: 13 January 2022 / Revised: 5 February 2022 / Accepted: 8 February 2022 / Published: 11 February 2022
Alkali-activated systems (AAS) represent an ecologically and economically sustainable inorganic binder as an alternative to ordinary Portland cement (OPC). One of the main benefits of AAS is their durability in aggressive environments, which can be equal or even better than that of OPC. In this paper, the influence of the type of alkaline activator in alkali-activated blast furnace slag (AAS) in terms of resistance to sulfur dioxide corrosion was investigated. The durability testing process was based on the CSN EN ISO 3231 standard and simultaneously compared with mortar samples prepared by using Blastfurnace cement CEM III/A 32.5R. The degradation progress was evaluated by employing several different methods such as observing the compressive strength development, weight change evaluation, non-destructive testing methods like ultrasound or impact echo technique, or visual phenolphthalein technique. Subsequently, fundamental characterization of samples by the XRD method was performed during the degradation test. The obtained results indicate that none of the testing methods used could be prioritized over others to determine the resistance of AAS against the action of sulfur dioxide. For this reason, the durability testing of AAS remains an issue, and the development of specific standards considering the behavior of AAS seems necessary. View Full-Text
Keywords: alkaline activation; blast furnace slag; sulfur dioxide; corrosion resistance; non-destructive testing; degradation characterization alkaline activation; blast furnace slag; sulfur dioxide; corrosion resistance; non-destructive testing; degradation characterization
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MDPI and ACS Style

Hrubý, P.; Kalina, L.; Bílek, V., Jr.; Keprdova, S.; Másilko, J.; Plšková, I.; Koplík, J.; Topolář, L. Comparison of Testing Methods for Evaluating the Resistance of Alkali-Activated Blast Furnace Slag Systems to Sulfur Dioxide. Materials 2022, 15, 1344. https://doi.org/10.3390/ma15041344

AMA Style

Hrubý P, Kalina L, Bílek V Jr., Keprdova S, Másilko J, Plšková I, Koplík J, Topolář L. Comparison of Testing Methods for Evaluating the Resistance of Alkali-Activated Blast Furnace Slag Systems to Sulfur Dioxide. Materials. 2022; 15(4):1344. https://doi.org/10.3390/ma15041344

Chicago/Turabian Style

Hrubý, Petr, Lukáš Kalina, Vlastimil Bílek Jr., Sarka Keprdova, Jiří Másilko, Iveta Plšková, Jan Koplík, and Libor Topolář. 2022. "Comparison of Testing Methods for Evaluating the Resistance of Alkali-Activated Blast Furnace Slag Systems to Sulfur Dioxide" Materials 15, no. 4: 1344. https://doi.org/10.3390/ma15041344

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