Degradation of Alkali-Activated Slag and Fly Ash Mortars under Different Aggressive Acid Conditions
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7
Abstract
Acidic environments constitute serious chemical threats to concrete-like cementitious materials. The purpose of this study is to experimentally investigate the degradation of alkali-activated slag/fly ash mortars with different slag/fly ash ratios: , , and in acidic environments. Mortar samples were exposed to three different types of aggressive acidic solutions: phosphoric acid, sulfuric acid, and a mixture of phosphoric acid and sulfuric acid maintained at a constant pH value of for a period of 150 days. Results showed that, for all mortar samples, the aggressivity of the phosphoric acid is greater compared to the other acids. Moreover, samples with a slag/fly ash ratio of demonstrate the highest resistance against the three types of acidic environments. In addition, it shows that the degradation process of alkali-activated mortars can be divided into two degradation stages: an early stage and a subsequent stage. The chemical-reaction dominated early degradation stage is described by using Hill function, whereas a diffusion process–dominated subsequent stage is simulated with Fick’s second law. Finally, the results of theoretical analysis predicted that the degradation depth of alkali-activated slag/fly ash mortars exposed to sulfuric acid environment () for 50 years could be reduced by about 52%–60% compared to that of an ordinary Portland cement (OPC)-based mortar.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by Chinese Scholarship Council (CSC), the Australian Research Council (IH150100006), and the Geopolymer and Minerals Processing Group laboratory at The University of Melbourne. The authors also express their thanks to Mrs. Laura Jukes for her assistance with the experimental work.
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Journal of Materials in Civil Engineering
Volume 33 • Issue 7 • July 2021
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© 2021 American Society of Civil Engineers.
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Received: Dec 5, 2019
Accepted: Oct 14, 2020
Published online: Apr 22, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 22, 2021
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