engleski

3D Modeling of transport phenomenon in cement based materials

This paper presents an overview on a number of selected methods for modeling transport phenomenon in porous microstructure of cement based materials. The two main methodological approaches in modeling the microstructure evolution of cement based materials are: 1) digitalization of the experimental image of the real microstructure and 2) a continuous concept of growing spheres models. Representative microstructure obtained either by simulation packages (e.g. CEMHYD3D, HYMOSTRUC, MIKE and DuCOM) or experimentally (e.g. micro tomography) is a starting point for further analysis of transport properties. Rapid development of 3D numerical models has provided a number of methods to investigate the influence of microstructure on the evolution of transport properties of cement based materials. There are two main network approaches which may be employed, here termed as 1) direct and 2) indirect. In direct approach each pixel in the 3D microstructure is mapped into a node in either a finite element or finite difference analysis. The indirect approach constructs a convenient pore network of mostly larger pore elements that replicate the essential features of the pore space that are relevant to transport properties and thus tremendously reduce the computational costs.

cement based materials ; diffusion ; transport properties ; durability ; concrete ; porous microstructure ; mathematical modeling.

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