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NTIS 바로가기콘크리트학회논문집 = Journal of the Korea Concrete Institute, v.28 no.3, 2016년, pp.317 - 328
강성훈 (서울대학교 건축학과) , 문주혁 (싱가포르국립대학교 건설.환경 공학과) , 홍성걸 (서울대학교 건축학과)
This research intends to understand the impact of super-absorbent polymer (SAP) as an internal curing agent in Ultra-High Performance Concrete (UHPC). Two different types of SAPs of acrylic acid (SAP_AA) and acrylic acid-co-acrylamide (SAP_AM) were examined with UHPC formulation. Isothermal calorime...
핵심어 | 질문 | 논문에서 추출한 답변 |
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SAP의 혼입이 콘크리트의 압축강도에 미치는 영향이 주요 연구주제가 되는 이유는? | SAP의 혼입이 콘크리트의 압축강도에 미치는 영향 역시 주요 연구주제이다. 그 이유는 압축강도는 콘크리트의 대표적인 재료특성이며, HPC와 UHPC는 높은 압축강도가 주요 장점인 재료이기 때문이다. 콘크리트에 SAP을 혼입한 실험결과를 살펴보면 대부분 강도 하락이 보고되고 있으며, 그 범위는 최대 30%까지 나타나고 있다. | |
UHPC의 특징은? | 또한, 자기수축은 종결 이전 초기 경화과정에서 부터 발생하므로 초기 재령일에서 균열 발생 가능성을 높게 만든다.2) 특히, UHPC는 단위 시멘트량과 시멘트 대비 실리카 퓸의 중량비율이 각각 700~1,000 kg/m3, 0.2~0.25 범위로 매우 높고, W/C는 0.25 이하로 매우 낮은 재료특성을 가진다.3,4) 이러한 재료특성 때문에 7일 이전의 초기 재령일에서 급격한 내부습도 감소가 발생하고 이는 급격한 자기수축으로 이어진다. | |
낮은 W/C에 의한 밀실한 콘크리트의 개발의 장단점? | 35인 고성능 콘크리트(HPC) 및 초고성능 콘크리트(UHPC)가 실용화되고 있다. 낮은 W/C에 의한 밀실한 콘크리트의 개발은 고강도 및 고내구성을 유도할 수 있었지만, W/C가 0.42 이상인 일반 콘크리트에서 나타나지 않는 추가적인 수축현상을 발생시켰다.1) 이러한 추가적인 수축현상은 시멘트가 물과 함께 수화 반응함으로써 나타나는 자기건조(Self-desiccation) 현상과 관계된 것이며, W/C가 낮을수록 더욱 두드러지게 나타난다. |
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