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Analysis of thermal cracks in mass concrete pipeline during cooling by particle flow program

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Document pages: 10 pages

Abstract: Pipe cooling system is one of the potential effective measures to control the temperature of mass concrete. However, if not controlled properly, thermal cracking may occur in concrete, especially near water pipes, as experienced in many mass concrete structures. In this paper, a new numerical simulation method of thermal crack based on particle flow program is used to further reveal the propagation process of thermal crack and the influence of thermal crack on thermal field. The key details of the simulation are introduced, including the process of obtaining the thermal and mechanical properties of particles. Importantly, a heat flow boundary based on analytical solution is proposed and used in two-dimensional particle flow sequence to simulate the effect of pipe cooling. Simulatoron results are in good agreement with the monitored temperature data and observations on cored specimens from a real concrete gravity dam, giving confidence to the appropriateness of the adopted simulation. The simulated results also clearly demonstrate why thermal cracks occur and how they propagate, as well as the influence of such cracks on thermal fields.

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