Abstract
The presence of a temperature difference changes the mode of motion of the fluid. The macroscopic motion of the fluid causes the relative displacement between the various parts of the fluid, which in turn affects the transfer of temperature in the medium. To investigate the effect of temperature transfer coupled fluid motion on chloride ion transport in concrete, a mesoscopic model of chloride ion transport in non-isothermal flow of concrete was established and compared with experimental data. Based on the finite element software, the influence of temperature transfer on the internal fluid motion and chloride ion transport of concrete was analyzed. And the effect of convective motion of fluid on the temperature transfer in concrete was studied. It is found that when the heating time is the same, the dynamic viscosity of the fluid in the concrete decreases with the increase of temperature; the chloride ion concentration increases with the increase of temperature at the same depth of concrete; when considering the influence of laminar flow, the temperature is transmitted faster in the concrete and exhibits uneven diffusion from high temperature to low temperature; non-isothermal flow promotes the diffusion of chloride ions in concrete, and the higher the temperature.
Highlights
The transmission of chloride ions in concrete is the first stage of the service life of reinforced concrete in marine engineering, and it is a key factor affecting the total service life of the concrete
4.1 Effect of temperature transfer on laminar flow and chloride ion transport in saturated concrete We set four temperature conditions: 5 °C, 20 °C, 40 °C, and 60 °C to characterize the ambient temperature on one side of the concrete
It can be seen from the figure that the laminar flow velocity inside the concrete increases with increasing temperature
Summary
The transmission of chloride ions in concrete is the first stage of the service life of reinforced concrete in marine engineering, and it is a key factor affecting the total service life of the concrete. This paper establishes a 2-D electrochemical chloride extraction mesoscale model, and based on Navier-Stokes equations, and the finite element method is used to simulate the non-isothermal flow coupled with chloride ion diffusion in concrete components. Based on this simulation, the effects of temperature transfer on the fluid motion and chloride ion migration in the concrete are analyzed, and the effect of convective motion of the fluid on the temperature transfer of concrete is studied
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