Production and Quality Control of Long Distance Delivered High Strength Concrete

장거리 운반 고강도 콘크리트 제조 및 품질관리

  • 박연동 (동양중앙연구소 선임연구원, 공박) ;
  • 정재동 (대구대학교 건축공학과 교수, 공박) ;
  • 박기청 (동양중앙연구소 수석연 구원) ;
  • 노재호 (동양중앙연구소) ;
  • 조일호 (동양시멘트 대전공장 품질관리 실 대리) ;
  • 방희상 (동양시멘트 안양공장 품질관리실장) ;
  • 국중욱 (동양시멘트 건설사업 본부 설계기획팀)
  • Published : 1995.04.01

Abstract

High strength ready-miced concrete with delivering time of about 90 minutes is successfully produced at ready-mixed concrete plant and placed columns and retaining walls of a tall building without any problems. The design strength of the concrete is 450 kgf/$\textrm{cm}^2$ and the required average compressive strength is 540 kgf/$\textrm{cm}^2$ according to ACI 363R-84 report with assumed coefficient of variation of 12% For the producing of good quality concrete, many laboratary and field tests are carried out. As the results of this study, the slump loss of high strength concrete is largely influenced by kinds of superplasticizer. The measured pump pressure of high strength concrete with slump of 22cm is higher than that of normal strength concrete with slump of 18cm by about 20~30% The measured average 28-day compressive strength of the concrete is 551 kgf/$\textrm{cm}^2$ and the coefficient of variation is 2.3%

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