How does fly ash mitigate alkali–silica reaction (ASR) in accelerated mortar bar test (ASTM C1567)?

By Seyed Shafaatian, A. Akhavan, Hamed Maraghechi, F. Rajabipour. 2013

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Comparison of fly ash, silica fume and metakaolin from mechanical properties and durability performance of mortar mixtures view point (2014, background): “In addition, resistance of the mixture to freeze–thaw cycles [11], sulfate attack [12,13], acidic attack [14], alkali–aggregate reaction [15] and reinforcement corrosion [16] as well as transport properties of the mixture [17,18] were reported to be improved with the addition of mineral admixture.”
Value added utilization of by-product electric furnace ferronickel slag as construction materials: A review (2018, background): “Thirdly, it can reduce the aggregate dissolution rate (Shafaatian et al., 2013).”
Expansion due to alkali-silica reaction of ferronickel slag fine aggregate in OPC and blended cement mortars (2016, methodology): “[22] showed that expansion of mortar 80 specimens containing reactive aggregates was reduced by the use of fly ash as a partial 81 replacement of cement.”