Abstract
The experimental setup was constructed to measure the thermal effect of the salt crystallization/dissolution process in building materials containing sodium sulphate. Additional heat was released/consumed during the salt crystallization/dissolution. The mathematical model of salt, moisture and energy transport concerning the salt phase change kinetics was derived and based on it the computer code was developed. To solve the set of partial differential, governing equations the finite element and finite difference methods were used. By solving the inverse problem the parameters of the rate law for brick saturated with the sodium sulphate solution were determined.
Highlights
The experimental setup was constructed to measure the thermal effect of the salt crystallization/dissolution process in building materials containing sodium sulphate
Salt is one of the factors, which affect the durability of the porous building materials
The heat which was produced during the crystals growth and consumed during the crystals dissolution was analysed. Based on it one could have estimated the material parameters appearing in the equation defining the salt crystallization kinetics
Summary
Salt is one of the factors, which affect the durability of the porous building materials (corrosion of steel bars inside reinforced concrete elements induced by chlorides, efflorescence on the surface, crystallization pressure). The paper consists of two parts: the experimental and theoretical investigation of mass and energy transport considering salt phase change. It consisted of two brick samples, one saturated with pure water and the later with sodium sulphate solution, whose saturation strongly depended on the temperature. In order to calculate the supersaturation ratio the kinetics of salt phase change was taken into account In such a model one did not know the explicit relation between the dissolved salt concentration and the amount of the precipitated salt. Comparing the experimental data with the computer simulation results, which take into account the crystallization/dissolution enthalpy, the material parameters appearing in the rate law for brick saturated with the sodium sulphate solution were determined
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
