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Air quenched basic oxygen furnace steel slag(BOF-SS)is processed at very high cooling rate,which is expected to have different cementitious properties from conventional slowly cooled BOF-SS.For this purpose,the strength activity indexes of air quenched and slowly cooled BOF-SS are investigated.The results reveal that,under the specific surface area(S) of 490m~2/kg,the compressive strength activity index reaches 1.24 after 28days with replacement of 15% air quenched BOF-SS and reaches 1.05 after 28days with replacement of 20% air quenched BOF-SS and 30% granulated blast furnace slag(GBFS).The cementitious activity of air quenched BOF-SS is obviously higher than that of slowly cooled BOF-SS,mainly because it contains more C_3S and glassy phases.
Air quenched basic oxygen furnace steel slag (BOF-SS) is processed at very high cooling rate, which is expected to have different cementitious properties from conventional slowly cooled BOF-SS. For this purpose, the strength activity indexes of air quenched and successively cooled The compressive strength activity index reaches 1.24 after 28 days with replacement of 15% air quenched BOF-SS and reaches 1.05 after 28days The cementitious activity of air quenched BOF-SS is obviously higher than that of slowly cooled BOF-SS, because it contains more C_3S and glassy phases.