The Water-Dependent Evolution of Pore Size Distribution due to Hydro-Chemical Transport within Cement-based Materials

This work explores the evolution of pore structure by considering the coupling effect of ionic transport and chemical reaction, especially salt precipitation. The reactive transport system is based on two sets of equations: a set of partial differential equations based on mass conservation for the i...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2021-01, Vol.1044 (1), p.12004
Main Authors: Qing xiang, XIONG, Fekri, MEFTAH
Format: Article
Language:English
Subjects:
Chemical precipitation
Chemical reactions
Dissolution
Evolution
Mathematical models
Microstructure
Numerical models
Partial differential equations
Pore size distribution
Porosity
Saturation
Transport properties
Transportation systems
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Summary:This work explores the evolution of pore structure by considering the coupling effect of ionic transport and chemical reaction, especially salt precipitation. The reactive transport system is based on two sets of equations: a set of partial differential equations based on mass conservation for the ionic transport, and a set of nonlinear algebraic equations based on the law of mass action for the chemical processes. By adopting this model, transport properties such as ionic concentration and mass of chemical components are implemented. The porosity and the water saturation degree are also considered and examined in our work. Besides, we propose a probabilistic-based porous network representing the evolution of microstructure induced by precipitation/dissolution. The probabilistic porous network is the interconnection between the microstructure and the macro properties. With a given water saturation degree and porosity calculated by the reactive transport model, we could establish the water-dependent evolution of pore structure in cement-based materials. Such a numerical model could be used to interpret the mechanism of the local precipitation/dissolution process in pore scales, which cannot be implemented by experimental measurements.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1044/1/012004