Computers and Concrete

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Development of a computer aided program for slipforming operations incorporating maturity approach

  • Hossain, K.M.A. (Department of Civil Engineering, Ryerson University) ;
  • Anagnostopoulos, C. (Colt Engineering) ;
  • Lachemi, M. (Department of Civil Engineering, Ryerson University)
  • Received : 2006.01.20
  • Accepted : 2006.06.22
  • Published : 2006.04.01
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Abstract

Slipforming is a construction method in which the forms move continuously during the placement of concrete. This paper presents the development of a computer aided program designated as "CADSLIPFORM" for slipforming operations. The program incorporates maturity methods for the prediction of initial setting times of slipform concrete layers using laboratory data (time-temperature histories and setting times of concrete mixtures at different temperatures) and generates slipform mock-up times. The performance of CADSLIPFORM is validated by comparing simulated mock-up times with those estimated in the field through conventional hard front by rod (R) method. Moreover, the program versatility is demonstrated by illustrating mock-up simulations for different cases with variable slipform parameters such as: number and thickness of concrete layers, concrete temperature (simulating variable setting times) and slipform speed. The program also incorporates the choice of Freiesleben Hansen & Pederson (FHP) and Carino & Tank (CT) maturity functions. CADSLIPFORM can assist user to develop reliable schedule of slipforming operation suitable for a specific project by optimizing various slipform parameters.

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References

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