For the use of recycled aggregate concrete, the early strength is evaluated. The test variables are replacement ratio of recycled aggregate, steel fiber and blast furnace slag powder. For this, 6th concrete mixing plan is prepared. As a result, it is evaluated that the early strength depends on the steel fiber volume fraction and replacement ratio of blast furnace slag powder.

• 이현호(동양대학교 건축소방행정학과 교수, 공학박사) | Lee, Hyun Ho 교신저자