Thermal Simulation of Rolled Concrete Dams: Influence of the Hydration Model and the Environmental Actions on the Thermal Field
| Autor: | Cristian Ponce-Farfán, Miguel Angel Rubio Toledo, David Santillán |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Roller-compacted concrete
Engineering Civil lcsh:Hydraulic engineering Geography Planning and Development 020101 civil engineering 02 engineering and technology Aquatic Science Biochemistry 0201 civil engineering lcsh:Water supply for domestic and industrial purposes 0203 mechanical engineering lcsh:TC1-978 Thermal insulation Heat exchanger Thermal heat generation Adiabatic process Water Science and Technology lcsh:TD201-500 dam construction rolled compact concrete Computer simulation Mathematical model business.industry Mechanics thermal model 020303 mechanical engineering & transports numerical simulation Heat generation Environmental science business roller-compacted concrete |
| Zdroj: | Water Volume 12 Issue 3 Water, Vol 12, Iss 3, p 858 (2020) |
| Popis: | Mathematical models for the simulation of the thermal evolution of roller-compacted concrete (RCC) dams during construction constitute an important tool for preventing excessive temperature rise, which may lead to cracking and losses of functionality. Here, we present a framework for the simulation of the thermal process. We define the boundary conditions of the problem using a careful description that incorporates the main heat exchange mechanisms. We adopt both a non-adiabatic and an adiabatic heat generation model for the simulation of the cement hydration. Our numerical framework lets us study the effect of the adopted heat generation model on the thermal field. Moreover, we study the influence of the weather conditions on the evolution of the hydration, and on the starting date of construction. Our simulations have shown that the hydration model has an important influence over the temperature field during the construction and the heat generation rate. Moreover, the hydration process and the temperature evolution are driven by the weather conditions. Once the next lift is cast, its thermal insulation effect makes the hydration take place under quasi-adiabatic conditions. As expected, dams built in cold months are prone to dissipate more heat than those built in warm seasons. |
| Databáze: | OpenAIRE |
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