혼화재를 사용한 콘크리트의 응결 시간에 미치는 초지연제의 영향

Super Retarding Agent Affecting Setting Time of Concrete Using Mineral Admixture

  • 전충근 ((주)선엔지니어링 건설기술연구소) ;
  • 김종 ((주)선엔지니어링 건설기술연구소) ;
  • 한민철 (청주대학교 산업과학연구소) ;
  • 신동안 ((주)선엔지니어링 건설기술연구소) ;
  • 오선교 ((주)선엔지니어링) ;
  • 한천구 (청주대학교 건축공학부)
  • 발행 : 2005.11.01

초록

This paper reports the influence of super retarding agent(SRA) on the setting time of concrete incorporating mineral admixture including fly ash(FA), expansive additive(EA), silica fume(SF), blast furnace slag(BS) and blast furnace slag along with fly ash(BS+FA). An increase in SRA resulted in retarding the setting time of control concrete, while the use of mineral admixture led to a delay of setting time markedly, compared with that of control concrete under no SRA content. Meanwhile, An increase in SRA in concrete with mineral admixture exhibited comparable setting delay with control concrete. Furthermore, in case of the use of BS and SF, acceleration of setting time was observed with increase of SRA content. It is considered that proper dosage of SRA of concrete with SF and BS to secure similar setting delay with control concrete require rather larger than that of control concrete. Accordingly, For concrete with mineral admixture, in order to decide the proper dosage of SRA, application of correction factors is needed.

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