Abstract
The objective of this research is to estimate the effective thermal conductivity model for the reinforced concrete containing round rebars. The thermal network concept and Fourier’s law are used to develop a mathematical model to calculate the effective thermal conductivity (keff) of reinforced concrete with different numbers of round rebars oriented either normal or parallel to the heat-transfer direction, and different volume fractions of steel. Model predictions generally agree well with results of numerical simulations using the finite-volume method (FVM). FVM results suggest that at fixed volume fractions of steel, the effective thermal conductivity decreases as the number of round rebars increases if the rebars are in the normal orientation but increases as the number of round rebars increases if they are in the parallel orientation. This research can be used in practical conditions to predict the effective thermal conductivity of reinforced concrete containing round rebars accurately.
Highlights
Thermal analysis of concrete structures can be used to evaluate the insulation of buildings and to estimate the extent of concrete cracks (Kim et al 2003)
To evaluate how ΦS and Nre affected the keff of reinforced concrete, the results of finite-volume method (FVM) were compared with the mathematical model
5 Conclusion This paper presents a model based on the thermal network concept and Fourier’s law, a model to predict the effective thermal conductivity(keff) of reinforced concrete containing round rebars
Summary
Thermal analysis of concrete structures can be used to evaluate the insulation of buildings and to estimate the extent of concrete cracks (Kim et al 2003). Demand for precise analysis in concrete structures is increasing, for example for analysis of heat sinks in nuclear power plants after Fukushima accident (Noh et al 2017). Thermal conductivity of concrete is an important property for thermal analysis of concrete structures such as buildings and nuclear power plants, and in general civil engineering. Many researchers have investigated key factors determining thermal conductivity of concrete (Kim et al 2003; Uysal et al 2004; Davraz et al 2015). Reinforced concrete that includes steel rebars is used in most concrete structures. Predicting effective thermal conductivity keff of reinforced concrete is very important
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