Alkali–aggregate reaction in activated fly ash systems

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Alkali-activated concrete: Engineering properties and stress–strain behavior (2015, background): “Although the literature is somewhat conflicted with regard to durability, most available studies have shown activated concrete to exhibit increased resistance to chloride penetration [20,26,27], acid attack [28–30], and sulfate attack [31], and reduced potential for deleterious alkali–silica reactio”
Durability of alkali-activated binders: A clear advantage over Portland cement or an unproven issue? (2012, background): “[43] showed that alkali-activated fly ash is less susceptible to generate expansion by alkali–silica reaction than OPC.”
Prediction of Compressive Strength of Geopolymer Concrete Using Entirely Steel Slag Aggregates: Novel Hybrid Artificial Intelligence Approaches (2019, background): “Many researchers pointed out the advantages of GPC, including chemical resistance or resistance to acid attack [2], alkali–silica reactions [3,4], corrosion of steel reinforcement [3,5,6], resistance to high temperatures and to fire [7,8], resistance to freeze–thawing [9,10], and efflorescence [11,1”
Review on fly ash-based geopolymer concrete without portland cement (2011, background): “Lodeiro et al. (2007) discovered that geopolymer are less prone to formation of alkali silica gel.”