Effect of Modified Argon Oxygen Decarburization (AOD) Stainless Steel Slag on Cementitious Properties

The stainless steel slag of argon oxygen decarburization (AOD) is a kind of alkaline waste with cementitious activity phase, which can change the beta-C2S to gamma-C2S phase in the process of natural cooling and reduce the cementitious activity of the steel slag. What's worse, the large difference of the density of the two crystal phases will lead the AOD slag to pulverize. In the present study, the effect of several modifiers, such as B2O3, P2O5 and CuO, which try to prevent the crystal transition of beta-C2S and reduce the cementitious activity of AOD slag was studied. The result showed that the curing effect of stainless steel slag became much better with the increase of B2O3 and P2O5 contents, and the compressive strength appeared to have a decline trend after an initial ascent. In general, the activity index of the modified stainless steel slag was higher than before, while the compressive strength and activity index had no obvious changes with the increase content of CuO.