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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국계산역학회 Computers and Concrete, An International Journal Computers and Concrete, An International Journal Vol.21 No.3
- 발행연도
- 2018.1
- 수록면
- 279 - 289 (11page)
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초록· 키워드
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Hydration heat and thermal induced cracking have always been a fatal problem for massive concrete structures. In order to study a massive reinforced concrete wall of a storage tank for liquefied natural gas (LNG) during its construction, two mock-ups of 0.8 m×0.8 m×0.8 m without and with metal corrugated pipes were designed based on the actual wall construction plan. Temperature distribution and strain development of both mock-ups were measured and compared inside and on the surface of them. Meanwhile, time-dependent thermal and mechanical properties of the concrete were tested standardly and introduced into the finite-element (FE) software with a proposed hydration degree model. According to the comparison results, the FE simulation of temperature field agreed well with the measured data. Besides, the maximum temperature rise was slightly higher and the shrinkage was generally larger in the mock-up without pipes, indicating that corrugated pipes could reduce concrete temperature and decrease shrinkage of surrounding concrete. In addition, the cooling rate decreased approximately linearly with the reduction of heat transfer coefficient h, implying that a target cooling curve can be achieved by calculating a desired coefficient h. Moreover, the maximum cooling rate did not necessarily decrease with the extension of demoulding time. It is better to remove the formwork at least after 116 hours after concrete casting, which promises lower risk of thermal cracking of early-age concrete.
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참고문헌 (35)
참고문헌 신청
Abbasi, A. / 2005 / A model for predicting the properties of the constituents of a glass fibre rebar reinforced concrete beam at elevated temperatures simulating a fire test / Compos. Part B Eng. 36(5):384~393
2007 / ACI 207, Report on Thermal and Volume Change Effects on Cracking of Mass Concrete
2010 / ACI 231, Report on Early-Age Cracking: Causes, Measurement and Mitigation
Amin, M.N. / 2009 / Simulation of the thermal stress in mass concrete using a thermal stress measuring device / Cement Concrete Res. 39(3):154~164
Asan, H. / 2006 / Numerical computation of time lags and decrement factors for different building materials / Build. Environ. 41(5):615~620
2007 / ACI 207, Report on Thermal and Volume Change Effects on Cracking of Mass Concrete
2010 / ACI 231, Report on Early-Age Cracking: Causes, Measurement and Mitigation
Amin, M.N. / 2009 / Simulation of the thermal stress in mass concrete using a thermal stress measuring device / Cement Concrete Res. 39(3):154~164
Asan, H. / 2006 / Numerical computation of time lags and decrement factors for different building materials / Build. Environ. 41(5):615~620
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