지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2012.1
- 수록면
- 523 - 534 (12page)
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초록· 키워드
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The objective of this study was to experimentally investigate the effect of heat curing methods on the temperature history and strength development of slab concrete exposed to -10°C. The goal was to determine proper heat curing methods for the protection of nuclear power plant structures against early-age frost damage under adverse (cold) conditions. Two types of methods were studied: heat insulation alone and in combination with a heating cable. For heat curing with heat insulation alone, either sawdust or a double layer bubble sheet (2-BS) was applied. For curing with a combination of heat insulation and a heating cable, an embedded heating cable was used with either a sawdust cover, a 2-BS cover, or a quadruple layer bubble sheet (4-BS) cover. Seven different slab specimens with dimensions of 1200 600 200 mm and a design strength of 27 MPa were fabricated and cured at -10°C for 7 d. The application of sawdust and 2-BS allowed the concrete temperature to fall below 0°C within 40 h after exposure to -10°C, and then, the temperature dropped to -10°C and remained there for 7 d owing to insufficient thermal resistance. However, the combination of a heating cable plus sawdust or 2-BS maintained the concrete temperature around 5°C for 7 d. Moreover, the combination of the heating cable and 4-BS maintained the concrete temperature around 10°C for 7 d. This was due to the continuous heat supply from the heating cable and the prevention of heat loss by the 4-BS. For maturity development, which is an index of early-age frost damage, the application of heat insulation materials alone did not allow the concrete to meet the minimum maturity required to protect against early-age frost damage after 7 d, owing to poor thermal resistance. However, the combination of the heating cable and the heat insulating materials allowed the concrete to attain the minimum maturity level after just 3 d. In the case of strength development, the heat insulation materials alone were insufficient to achieve the minimum 7-d strength required to prevent early-age frost damage. However, the combination of a heating cable and heat insulating materials met both the minimum 7-d strength and the 28-d design strength owing to the heat supply and thermal resistance. Therefore, it is believed that by combining a heating cable and 4-BS, concrete exposed to -10°C can be effectively protected from early-age frost damage and can attain the required 28-d compressive strength.
목차
등록된 정보가 없습니다.
참고문헌 (12)
참고문헌 신청
/ 1990 / ACI Committee 306, Cold weather concreting
Architectural Institute of Japan (AIJ) / 2000 / Recommendation for practice of cold weather concreting : 139 ~ 140
Freisleben HP / 1977 / Maturity computer for controlled curing and hardening of concrete strength / Nordisk Betong 1 : 19 ~ 34
Han CG / 2005 / Temperature history of slab concrete depending on insulation curing method in cold weather concreting / The Korea Institute of Building Construction 5 : 17 ~ 21
Han CG / 2009 / Field application of insulation curing method with double bubble sheets subject to cold weather / The Korea Institute of Building Construction 9 : 25 ~ 29
Architectural Institute of Japan (AIJ) / 2000 / Recommendation for practice of cold weather concreting : 139 ~ 140
Freisleben HP / 1977 / Maturity computer for controlled curing and hardening of concrete strength / Nordisk Betong 1 : 19 ~ 34
Han CG / 2005 / Temperature history of slab concrete depending on insulation curing method in cold weather concreting / The Korea Institute of Building Construction 5 : 17 ~ 21
Han CG / 2009 / Field application of insulation curing method with double bubble sheets subject to cold weather / The Korea Institute of Building Construction 9 : 25 ~ 29
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