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Analytical Method for Moisture Vaporization of Concrete under High Temperature

고온조건에서 콘크리트의 수분증발 해석기법

  • 이태규 (우송대학교 철도건설시스템학부)
  • Received : 2017.04.06
  • Accepted : 2017.05.31
  • Published : 2017.07.28

Abstract

Moisture evaporates, when concrete is exposed to fire, not only at concrete surface but also at inside the concrete to adjust the equilibrium and transfer properties of moisture. The equilibrium properties of moisture are described by means of water vapor sorption isotherms, which illustrate the hysteretical behavior of materials. In this paper, the prediction method of the moisture distribution inside the concrete members at fire is presented. Finite element method is employed to facilitate the moisture diffusion analysis for any position of member. And the moisture diffusivity model of high strength concrete by high temperature is proposed. To demonstrate the validity of this numerical procedure, the prediction by the proposed algorithm is compared with the test result of other researcher. The proposed algorithm shows a good agreement with the experimental results including the vaporization effect inside the concrete.

Keywords

Concrete;Moisture Diffusion;Vaporization;Emission;Sorption Isotherm

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