Field Application of the Difference of Setting Time of Improving Super Retarding Agent of Foundation Mat Mass Concrete

기초매트 매스 콘크리트의 초지연제를 활용한 응결시간차공법의 현장적용

  • 노상균 (청주대학교 대학원) ;
  • 백대현 (청주대학교 대학원) ;
  • 권해원 ((주)렉스콘 연구개발팀) ;
  • 배연기 ((주)렉스콘 연구개발팀) ;
  • 정성진 (두산건설(주) 해운대 두산 위브 더 제니스 현장) ;
  • 한천구 (청주대학교 건축공학과)
  • Published : 2008.11.14

Abstract

According to the recent tendency that the buildings in the downtown concerning rising land prices and efficient use of building are gradually Manhattanized mainly the grand scaled residential buildings, structure of the buildings relates to safety and so the very thick mat concrete is selected as the foundation of architectures. Because mat concretes can not be simultaneously pour in a great quantity due to the circumstance at the field, not only the questions on the unification between the concretes pour on the upper layer and the lower layer are presented but also the cracks by the internal force from the difference of hydration exothermic period are occurred because of the time lag. Thus, this study checked the efficiency to apply "The hydration heat controlling method of mass concrete for horizontal partition pouring construction" to the skyscraper sites under construction at Haiundai in Busan. After applying this method, the result of observation that the cracks by hydration heat in all over the placement surface did never be founded. Also, in case of the economic analysis that the hydration heat reduction method using super retarding agent by difference of setting time is approximately 80% cheaper than the hydration heat reduction method by pipe cooling in the construction expenses.

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