Fly ash is used in concrete to help eliminate the alkali - silica reactivity between portland cement and the surface of the aggregate. Alkali - Silica reactivity can turn concrete highways into very expensive gravel roads.
What else can be used in concrete to eliminate this problem.
Other supplementary materials such as slag and metakaolin can be used. In fact, some studies have also shown the viability of using glass powder (with sizes less than 300microns) to inhibit ASR in concrete mixtures incorporating glass as aggregates.
Article Use of fine glass as ASR inhibitor in glass aggregate mortars
Blast furnace slag, fine glass powder, or any other amorphous SiO2 rich industrial waste such as rice husk ash could be could be used for such porpoise. Also silica microdust is effective, but expensive so small amount of it could mixed together with other supplementary materials.
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