외기온 -20℃의 유지시간 변화에 따른 초기동해 피해의 기초적 연구

Fundamental Research of Early Frozen Damage on Concrete Depending on Various Time Periods of -20℃ Temperature Condition

The aim of the research is evaluating the feasibility of inspection for early age frozen damage and for expansion of concrete under the various time periods of -20℃ temperature condition. When the concrete samples were exposed for 12 hours and 24 hours, the frozen depth of the concrete were 10 and 60 mm, respectively, under the wet conditions. From the experiment results of temperature and expansion, only surface area suffered frozen damage for 12 hours exposing conditions while entire area suffered frozen damage for 24 hours exposing conditions.