DETERMINATION OF REACTIVE SILICA (SiO2) OF FLY ASH.

The reactive silica of fly ash as that fraction of SiO2 which is soluble after treatment with hydrochloric acid and with boiling potassium hydroxide solution. The quantity of reactive silica is determined by subtracting from the total silica content that fraction contained in the insoluble residue both on dry basis. [ABSTRACT FROM AUTHOR]