Abstract
40 fly ash samples obtained from 24 thermal power stations were used in a pozzolanic reactivity test, and 24 fly ashes, original ashes, and air stream classified ones from a single boiler were used in the alkali-silica reaction (ASR) control tests. This work evaluates the pozzolanic reactivity of fly ash estimating consumption ratio of Ca+2 in the cement and fly ash mixed suspension while considering interactions of other alkali ions released from the cement particle. The index derived from the acceleration test was termed Assessed Pozzolanic-reactivity Index (API) estimating the consumed Ca+2 ratio in the suspension. There was linear correlation between the API and activity indices from mortar tests. Conversely, the API also showed a linear correlation with expansion ratio, the control effect of fly ash on ASR, obtained from mortar tests. The API can stand for the ASR-controlling efficiency. Pozzolanic reactivity of fly ash significantly influences the control effect on ASR, the higher the pozzolanic reactivity, the higher the control effect on ASR.
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