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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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The Fundamental Characteristics for Mix Proportion of Multi-Component Cement

배합비에 따른 다성분계 시멘트의 기초특성

  • 김태완 (부산대학교 생산기술연구소) ;
  • 전재우 (부산대학교 토목공학과) ;
  • 서민아 (부산대학교 토목공학과) ;
  • 조현형 (부산대학교 토목공학과) ;
  • 배수연 (부산대학교 토목공학과)
  • Received : 2016.01.07
  • Accepted : 2016.03.15
  • Published : 2016.05.01
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Abstract

The aim of this research work is to investigate the mix proportion of multi-component cement incorporating ground granulated blast furnace(GGBFS), fly ash(FA) and silica fume(SF) as an addition to cement in ternary and quaternary combinations. The water-binder ratio was 0.45. In this study, 50% and 60% replacement ratios of mineral admixture to OPC was used, while series of combination of 20~40% GGBFS, 5~35% FA and 0~15% SF binder were used for fundamental characteristics tests. This study concern the GGBFS/FA ratio and SF contents of multi-component cement including the compressive strength, water absorptions, ultrasonic pulse velocity(UPV), drying shrinkage and X-ray diffraction(XRD) analysises. The results show that the addition of SF can reduce the water absorption and increase the compressive strength, UPV and drying shrinkage. These developments in the compressive strength, UPV and water absorption can be attributed to the fact that increase in the SF content tends basically to consume the calcium hydroxide crystals released from the hydration process leading to the formation of further CSH(calcium silicate hydrate). The strength, water absorption and UPV increases with an increase in GGBFS/FA ratios for a each SF contents. The relationship between GGBFS/FA ratios and compressive strength, water absorption, UPV is close to linear. It was found that the GGBFS/FA ratio and SF contents is the key factor governing the fundamental properties of multi-component cement.

본 연구는 고로슬래그 미분말 (GGBFS),플라이애시 (FA) 그리고 실리카 퓸( SF)을 각각 세 종류와 네 종류로 시멘트와 혼합한 다성분계 시멘트의 특성 연구에 관한 것이다. 물-결합재 비는 0.45 이다. 본 연구에서는 혼화재료를 시멘트의 50%와 60% 비율의 두 가지로 치환하였으며, 각 배합에 대해서 GGBFS는 20~40%, FA는 5~35% 그리고 SF는 0~10%를 배합하여 기초특성에 관한 실험을 수행하였다. GGBFS/FA 비와 SF 치환율에 따른 다성분계 시멘트에 대해 압축강도, 물 흡수율, 초음파 속도 (UPV), 건조수축 그리고 XRD 분석을 수행하였다. 실험결과 SF를 치환함에 따라 흡수율은 감소하고 압축강도, UPV와 건조수축은 증가하였다. 이러한 압축강도, 흡수율 그리고 UPV 등의 결과는 SF의 혼합률이 증가함에 따라 용출된 수산화칼슘을 소비하여 CSH의 형성에 기여하기 때문이다. 각 SF 혼합률에서 GGBFS/FA 비가 증가함에 따라 강도, 흡수율 그리고 UPV도 증가하였다. GGBFS/FA 비와 강도, 흡수율, UPV는 선형적인 관계를 나타내었다. 본 연구를 통해 GGBFS/FA비와 SF 치환율은 다성분계 시멘트의 기초 특성에 중요한 요소임을 발견할 수 있었다.

Keywords

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