Degradation of Alkali-Activated Slag and Fly Ash Mortars under Different Aggressive Acid Conditions
Jie Ren, Lihai Zhang, Rackel San Nicolas
JOURNAL OF MATERIALS IN CIVIL ENGINEERING | ASCE-AMER SOC CIVIL ENGINEERS | Published : 2021
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: 80/20, 60/40, and 40/60 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 2.5±0.5 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 r..View full abstract
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Awarded by Australian Research Council
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.