Field Application of Setting Time Difference Method Using SRA for Reduction of Hydration Heat of Mass Concrete

매스콘크리트의 수화열저감을 위한 초지연제 응결시간차 공법의 현장 적용 -대전 가오지구 코오롱 하늘채 아파트 현장-

In this paper, field application of mass concrete using setting time difference of super retarding agent is reported to reduce hydration heat of concrete placed at newly constructed apartment house in Daejeon. Horizontal placing lift is applied. According to test results,: slump and air content meets the requirement of target values. For compressive strength, it exceeds the nominal strength ordered by the costumer. For temperature history, maximum temperature of center at top section shows $25.6^{\circ}C$, and at bottom section, $35.4^{\circ}C$. According to naked eye's investigation, no hydration heat crack is observed at the surface of concrete.