매스콘크리트 시험체의 수화열 해석 및 실험

Numerical Simulation of Temperature and Stress Distribution in Mass Concrete with pipe cooling and Comparision with Experimental Measurements

  • 주영춘 (서울산업대학교 토목공학과) ;
  • 김은겸 (서울산업대학교 토목공학과) ;
  • 신치범 (아주대학교 화학공학과) ;
  • 조규영 (동아건설산업(주) 부장 (인천출장소)) ;
  • 박용남 (인천국제공항공사)
  • 발행 : 1999.04.01

초록

Various method have been developed for mass concrete structures to reduce the temperature increase of concrete mass due to exothermic hydration reactions of concrete compounds and thereby to avoid thermal cracks. One of the methods widely acceptable for practical use is pipe cooling, in which cooling is achieved by circulating cold water through thin-wall steel pipes embedded in the concrete. A numerical simulation was performed to investigate the effectiveness of pipe cooling. A three-dimensional finite element method was proposed to analyse the transient three-dimensional heat transfer between the hardening concrete and the cooling water in pipe and to predict the stress development during the curing process. The effects of the cement type and content and the environment were taken into consideration by the heat generation rate and the boundary conditions, respectively. In order to test the validity of the numerical simulation, a model RC structure with pipe cooling was constructed and the time-dependent temperature and stress distributions within the structure as well as the variation of the temperature of cooling water along the pipe were measured. The results of the simulation agreed well the experimental measurements. The results of this study have important implications for the optimal design of the cooling pipe layout and for the estimation of thermal stress in order to eliminate thermal cracks.

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