Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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The Properties of Multi-Component Blended High Fluidity Mortar

다성분계 고유동 모르타르의 특성

  • 김태완 (부산대학교 건설융합학부 토목공학전공) ;
  • 강충현 (전남대학교 해양토목공학과) ;
  • 배주룡 (부산대학교 건설융합학부 토목공학전공) ;
  • 김인태 (부산대학교 건설융합학부 토목공학전공)
  • Received : 2017.12.06
  • Accepted : 2018.02.28
  • Published : 2018.03.01
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Abstract

This research presents the results of an investigation on the characteristic of multi-component blended high fluidity mortars. The binder was blended ordinary Portland cement(OPC), ground granulated blast furnace slag(GGBFS), calcium sulfoaluminate(CSA) and ultra rapid setting cement(URSC). The GGBFS was replaced by OPC from 30%(P7 series), 50%(P5 series) and 70%(P3 series), CSA and URSC was 10% or 20% mass. The superplasticizer of polycarboxylate type were used. A constant water-to-binder ratio(w/b)=0.35 was used for all mixtures. Test were conducted for mini slump, setting time, V-funnel, compressive strength and drying shrinkage. According to the experimental results, the contents of superplasticizer, V-funnel and compressive strength increases with an increase in CSA or URSC contents for all mixtures. Moreover, the setting time and drying shrinkage ratio decrease with and increase in CSA or URSC. CSA decreased dry shrinkage but URSC had less effect. However, the mixed binders of CSA and URSC had a large effect of reducing drying shrinkage by complementary effect. This is effective for improving the initial strength of URSC, and CSA is effective for the expansion and improvement of long-term strength.

본 연구는 다성분계 고유동 모르타르의 특성에 관한 연구이다. 보통 포틀랜드 시멘트(OPC), 고로슬래그 미분말(GGBFS), 칼슘설포알루미네이트(CSA) 그리고 초속경시멘트(URSC)를 혼합한 결합재이다. GGBFS는 OPC 질량에 대해 30%(P7 series), 50%(P5 series) 그리고 70%(P3 series)치환하였고, CSA와 URSC는 10%와 20%를 치환하였다. 혼화제는 폴리카르복실계를 사용하였다. 모든 배합의 물-결합재 비(w/b)는 0.35로 일정하다. 실험은 미니슬럼프, V-funnel, 압축강도 그리고 건조수축을 측정하였다. 실험결과 CSA와 URSC의 치환율이 증가하면 혼화제 사용량, V-funnel 시간 그리고 압축강도는 증가하였다. 또한 응결시간과 건조수축은 CSA와 URSC의 치환율이 증가함에 따라 감소하였다. CSA는 건조수축을 감소시키지만 URSC는 효과가 미미하다. CSA와 URSC를 혼합한 결합제는 상호보완 작용에 의해 건조수축 감소 효과가 컸다. 이는 URSC의 초기강도 향상효과와 CSA의 팽창과 장기강도 향상효과 때문이다.

Keywords

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