Mock-up Test on the Reduction of Hydration Heat of Mass Concrete for Transfer Girder

전이보 매스콘크리트의 수화열 저감에 관한 Mock-up 실험

  • 윤섭 (청주대학교 대학원) ;
  • 황인성 (청주대학교 산업과학연구소) ;
  • 백병훈 (포스코건설 스타파크현장) ;
  • 한천구 (청주대학교 건축공학부)
  • Published : 2004.11.01

Abstract

This paper reported the results of mock-up test on mass concrete for transfer girder using setting time difference of super retarding agent(SRA). According to test results, two mock-up structures were made. Plain concrete without placing layer reached maximum temperature after 24hours since placement and caused surface hydration cracks at top section. However, concrete with placing layer reached maximum temperature after 72hours and surface temperature was higher than center temperature, which did not cause surface crack. After form removing, no crack was observed at side surface of plain concrete, while concrete using SRA at mid section had surface scaling and settling crack. According to coring results, concrete with placing layer had a penetration crack from top section to bottom section. Therefore, the setting time difference method to reduce hydration heat will have difficulty in applying the mass concrete for transfer girder.

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