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논문 기본 정보

자료유형
학술저널
저자정보
김용범 (단국대) 조한병 (단국대) 김학영 (단국대) 전우철 (두산건설) 박희곤 (두산건설) 정란 (단국대)
저널정보
대한건축학회 대한건축학회 논문집 - 구조계 大韓建築學會論文集 構造系 第31卷 第7號
발행연도
2015.7
수록면
67 - 74 (8page)

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초록· 키워드

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Due to a big difference of temperatures between the inside and outside and a high level of hydration heat on the core, some thermal stress is generated in mass Concrete. In turn, it causes the expansion of the concrete members and some cracks of the concrete joints that become the factors threatening the soundness of a concrete structure. Due to the reason, various kinds of low-heat concrete are being developed in domestic and foreign countries. In this study, some urea for industrial use which is used in microorganism cultivation agents, etc., is applied as a concrete mixing material in order to suppress the hydration heat of mass concrete. This is intended to lower down some levels of hydration heat and drying shrinkage of mass concrete. 21 kinds of concrete mixtures in total were designed at 3 kinds of W/B ratios, that is, 45, 50 and 55%. Thus, the dynamic characteristics, durability and hydration heat properties of urea-mixed concrete were verified through some experiments and the optimum mixing design was suggested. As the results of this study, the compressive strength of urea-mixed concrete at the age of 3 days decreased by 40% compared to that of plain concrete, but it showed the tendency recovering up to 95% at maximum at the age of 56days. On the other hand, the maximum temperature of urea-mixed concrete decreased down to 7.9 ℃at maximum thanks to the hydration heat compared with that of plain concrete and the point of time reaching the highest temperature of the urea-mixed concrete was delayed by 33.9 hours at maximum compared with that of plain concrete. In addition, it resulted that the length change rate of urea-mixed concrete decreased down to 56% at maximum thanks to the expansion characteristics of CaCO₃.

목차

Abstract
1. 서론
2. 요소(Urea)의 콘크리트 내 반응특성 고찰
3. 실험계획 및 방법
4. 실험결과 및 분석
5. 결론
Reference

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