Orthogonal test research of co mbined devel opment and utilization of steel slag and GGBS

The properties of cementitious materials with different steel slag and blast furnace slag ratio were researched.Base on that result,the orthogonal test was designed to add different excitant and changing specific surface area of steel slag powder.The results indicated that compared with the Portland cement,the setting time increased and compressive strength decreased with increasing of steel slag and blast furnace slag ratio.The water requirement for normal consistency had lowest point of 25.8% when the steel slag and blast furnace slag ratio was 3∶7.The best designed proposal was that the ratio of steel slag and blast furnace slag was 3∶7,the excitation was NS,specific surface area of steel slag was 500m2/kg,the total adding amount of steel slag and blast furnace slag was 40%,on the other hand,50% admixture was also acceptable,to extend the utilization of steel slag.