Mathematical Model for Effective Thermal Conductivity of Reinforced Concrete Including Round bar

The main purpose of this study is to propose effective thermal conductivity model of reinforced concrete including one round rebar as volume fraction of steel. Commonly, reinforced concrete consists of concrete and steel rebar. Mathematical model can be achieved by utilizing thermal network concept and Fourier's law for effective thermal conductivity. Mathematical model is compared with results of numerical simulation by using ANSYS-CFX tool in this paper. For accurate thermal analysis of reinforced concrete, effective thermal conductivity model can be widely used in many fields such as building, civil engineering and nuclear. The effective thermal conductivity model of reinforced concrete is proposed. Moreover, the effective thermal conductivity of reinforced concrete is numerically investigated by numerical simulation (ANSYS CFX 16.2). Mathematical model was compared with CFD results. Model value generally overestimates CFD results. Furthermore, differences between model and CFD results get larger as increasing volume fraction of steel.