An Experimental Study on the Effect of Reduced Slag and Gypsum on Concrete at Low Temperature(-5???)

??? ????????? ??????????????? ???????????? ?????? ?????????(???????????????)??? ?????????????????? ???????????? ??????????????? ????????? ????????? ???????????? –5??????????????? ??????????????? ????????? ??? ?????? ???????????????????????? ?????? ?????? ???????????? ??????, ????????? ????????? ????????????????????????????????? ????????? ????????? ?????? ????????? ???????????????. ???????????? ?????????????????? ???????????? ???????????? C12A7??? ????????? ?????????????????? ?????????????????? ?????????????????? ????????? ?????? ??????????????????????????? ?????????????????? ???????????? ???????????? ?????? ???????????? ???????????? ????????? ????????????. ?????? ????????? ??????????????????SO3??? ????????? ?????? ????????? ????????? ????????? ???????????? ??????????????? ????????? ????????????. ?????? ????????? 4% ????????? CR2G??????????????? ????????? Plain????????? ?????? ???????????? ???????????? ????????? ????????????. ?????? ?????????????????? ???????????? ????????? ??????????????? ????????? SO3??? ?????? ???????????? ??? ????????? ????????????. ????????????????????? ?????????????????? ???????????? ???????????? ?????? ???????????????????????? ???????????? ????????? ????????????. In this study, the development of concrete preventing initial frost damage and durability about that were evaluated by using anti-aging agent and admixture(reduced slag). As a result of experiment, initial hydration heat was increased by C12A7 of reduced slag components but it was not effective to development of strength. Also fluidity decreased with increasing replacement of reduced slag. This suggested that fluidity was low by rapid setting due to absent of gypsum in reduced slag components. In case of CR2G specimen that added 4% gypsum, the flow ability was higher than plain. It is considered that concrete developed using reduced slag should use SO3. Result of durability experiments, the durability decreased with increasing replacement amount of reduced slag