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Title |
Characteristics of Drying and Autogeneous Shrinkage in HPC with 65% Replacement of GGBFS
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Authors |
장승엽(Seung-Yup Jang) ; 류화성(Hwa-Sung Ryu) ; 윤용식(Yong-Sik Yoon) ; 권성준(Seung-Jun Kwon) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.3.054 |
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Keywords |
고로슬래그 미분말 ; 부산물 ; 대단위 치환 콘크리트 ; 강도 ; 건조수축 ; 자기수축 GGBFS ; Byproduct ; HVSC ; Strength ; Drying shrinkage ; Autogeneous shrinkage |
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Abstract |
GGBFS (Ground Granulated Blast Furnace Slag) is a byproduct with engineering advantages and HVSC (High Volume Slag Concrete) is widely attempted due to active utilization and reduction of eco-load. In the present work, characteristics of drying shrinkage and early-aged behavior are evaluated for the concrete with 65% replacement ratio of GGBFS and 50MPa of design strength. For the work, 3 different mix conditions are considered and several tests including slump flow, compressive strength, drying and autogeneous shrinkage are performed. From the test, OPC 100 mixture without replacement shows higher strength development before 7 days, however the strength reduction in concrete replaced with GGBFS is not significant due to sufficient free water for cement hydration. OPC 100 mixture also shows significant drying shrinkage due to a great autogeneous shrinkage before 3 days. In the concrete with GGBFS replacement, the drying shrinkage behavior is improved due to relatively small deformation by autogeneous shrinkage. The mixture (OPT BS 65) with lower w/b ratio (0.27) and unit content of water (160kg/m3) shows more improved shrinkage behavior than BS 65 mixture which has simple replacement of GGBFS with 0.30 of w/b and 165kg/m3 of water unit content.
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