Computers and Concrete

  • 제4권1호
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  • Pages.33-47
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  • 2007
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
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Numerical modeling of slipforming operations

  • Lachemi, M. (Department of Civil Engineering, Ryerson University) ;
  • Elimov, R. (Department of Civil Engineering, Ryerson University)
  • 투고 : 2006.03.27
  • 심사 : 2007.01.03
  • 발행 : 2007.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

Slipforming is a construction method in which the forms move continuously during concrete placement. This paper presents a numerical procedure based on the finite element method to simulate the thermal behavior of concrete during slipforming operations. The validity of the model was successfully tested by simulating a very complex but well documented field case of actual slipforming operations performed during the construction of an offshore concrete oil platform structure. The results obtained have been related to the shape of the concrete "hardened front" in the forms, which allows quick evaluation of the operation. The results of the numerical investigation have shown that the shape of the "hardened front" can be affected by the temperature of the fresh concrete and ambient conditions. For a given initial concrete temperature, there are limitations for the ambient temperature that, when exceeded, can create an unfavorable shape of the concrete "hardened front" in the forms. Similarly, for a given ambient temperature, the initial concrete temperature should not be fall below an established limit in order to avoid unfavorable shape of the "hardened front".

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참고문헌

  1. Acker, P. (1986), "Effets thermiques dans les betons en cours de fabrication et application aux ouvrages d'art de nouveaux outils pour une optimisation simultanee du cout et de la qualite", Annales de l'institut technique du batiment et des travaux publics, No. 442, Serie Beton, 235-247.
  2. Dubouchet, A. (1992), "Developpement d'un pole de calcul: CESAR-LCPC", Bulletin de Liaison des Laboratoires des Ponts et Chaussees, No. 178, March-April, 77-84.
  3. Elimov, R. (2003), "The control of concrete quality during slipforming operations", PhD Thesis, Civil Engineering Department, Universite de Sherbrooke, Canada, 166 p.
  4. Fossa, K.T. (2001), "Slipforming of vertical concrete structures: friction between concrete and slipform pane", Dr. Ing Thesis, Department of Structural Engineering, The Norwegian University of Science and Technology, Trondheim, Norway, N-7491.
  5. Humbert, P. (1989), "CESAR-LCPC: un code de calcul par elements finis", Bulletin de Liaison des Laboratoires des Ponts et Chaussees, No. 160, March-April, 112-115.
  6. Kjellsen, K.O., Detwiler, R.J. (1992), "Reaction kinetics of portland cement mortars hydrated at different temperatures", Cement Concrete Res. 22(1), 112-120. https://doi.org/10.1016/0008-8846(92)90141-H
  7. Lachemi, M. and Aitcin, P.-C. (1997), "Influence of ambient and fresh concrete temperatures on the maximum temperature and thermal gradient in a high-performance concrete structures", ACI Mat. J. 94(2), 102-110.
  8. Mather, B. (1987), "Warmer the concrete the faster the cement hydrates", Concrete. Int. 9(8), 29-33.
  9. Neville, A.M. (1999), "Specifying concrete for slipforming", Concrete. Int. 21(11), 61-63.
  10. Ulm, F.J. and Coussy, O. (1995), "Modeling of thermochemomechanical coupling of concrete at early age", ASCE J. Eng. Mech., 121(7), 785-794. https://doi.org/10.1061/(ASCE)0733-9399(1995)121:7(785)
  11. Woodhead, H.R. (1993), "Hibernia offshore oil platform", Concrete Int. 15(12), 23-30.