Blast furnace slag is recycled as high value-added material, while steel slag is difficult to recycle or is recycled as low value-added one relatively due to its expansion collapsability. It's property is caused by the high content of Free-CaO and unstable steel oxides. Currently, a technique to subdivide the process refining is introduced, can be divided into the electric furnace steel slag and reducing steel slag. In this study, Free-CaO in the electric arc furnace slag by the ethylene glycol method for the quantitative evaluation for the expansion to proceed with construction materials, electric arc furnace slag oxidation is to use.

• 임희섭(한양대학교 첨단건축도시환경공학과, 박사과정) | Lim, Hee Seob
• 이한승(한양대학교 건축학부 교수, 공학박사) | Lee, Han Seung
• 최재석(한국건설생활환경시험연구원 책임연구원, 공학박사) | Choi, Jae Seok