A composite mineral admixture was prepared by steel slag and superfine blast furnace slag.-einfluence of superfine blast furnace slag content of the composite mixture on the mortar and concrete was investigated. -e results show that the composite mineral admixture may decrease the strength of concrete at the early age but improve the strength development over time. Increasing the content of superfine blast furnace slag can reduce the degradation of the early strength. -e reduction of the autogenous shrinkage and adiabatic temperature rise is significant when the composite mineral admixture is added. -e reduction is more obvious when the water-to-solid ratio (w/s) is low. -eresults show that with steel slag and superfine blast furnace slag playing as complementary parts in the composite mineral admixture, it can be used as an effective substitute of cement.
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