고로슬래그 미분말을 65% 치환한 고성능 콘크리트의 자기 및 건조수축 특성
Characteristics of Drying and Autogeneous Shrinkage in HPC with 65% Replacement of GGBFS
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초록
고로슬래그 미분말은 공학적으로 우수한 건설산업 부산물이며, 최근들어 환경부하 저감 및 사용 활성화를 위해 대단위 슬래그 치환 콘크리트가 많이 연구되고 있다. 본 연구에서는 목표 강도를 50 MPa로 설정하고 고로슬래그미분말 치환률을 65%로 고려한 대단위 치환 슬래그 콘크리트를 제조하여 건조수축특성과 초지재령 특성을 평가하였다. 이를 위해 3 수준의 콘크리트를 제조하였으며, 슬럼프 플로우, 강도,건조 및 자기수축에 대한 실험을 수행하였다. 실험결과, 보통 포틀랜트 시멘트를 100% 함유한 콘크리트(OPC 100)에 비하여 재령 7일전의 강도는 약간 감소하였으나, 슬래그 치환 배합은 수화에 필요한 충분한 자유수를 가졌으므로 28일 재령에서는 우수한 강도 발현을 나타내었다. 또한 재령 3일까지 큰 자기수축으로 인하여, OPC 100 배합에서는 건조수축이 크게 평가되었지만, 65% 고로슬래그 미분말을 치환한 배합에서는초기재령의 자기수축 성능이 개선되어 우수한 건조수축거동을 나타내었다. 특히 단순 질량 치환배합(BS 65)보다 물-결합재비(0.27)와 단위수량(163kg/m3)을 낮춘 OPTBS 65에서 더욱 우수한 건조수축 및 자기수축 거동을 나타내었다.
Abstract
GGBFS (Ground Granulated Blast Furnace Slag) is a byproduct with engineering advantages and HVSC (High Volume Slag Concrete) iswidely attempted due to active utilization and reduction of eco-load. In the present work, characteristics of drying shrinkage and early-aged behaviorare evaluated for the concrete with 65% replacement ratio of GGBFS and 50MPa of design strength. For the work, 3 different mix conditions areconsidered and several tests including slump flow, compressive strength, drying and autogeneous shrinkage are performed. From the test, OPC 100mixture without replacement shows higher strength development before 7 days, however the strength reduction in concrete replaced with GGBFSis not significant due to sufficient free water for cement hydration. OPC 100 mixture also shows significant drying shrinkage due to a great autogeneousshrinkage before 3 days. In the concrete with GGBFS replacement, the drying shrinkage behavior is improved due to relatively small deformation byautogeneous shrinkage. The mixture (OPT BS 65) with lower w/b ratio (0.27) and unit content of water (160kg/m3) shows more improved shrinkagebehavior 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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