Journal article

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

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: 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..

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