Abstract
Diffusion of deleterious substances through concrete can severely affect its life. The widely varying constituent length scales of concrete contains micron-sized pores with centimetre-sized aggregates making diffusion a complex phenomenon. This study describes a multiscale model investigating factors of important concrete matrix constituents: pores and aggregates, including their interfaces on the diffusion behaviour of concrete. A finite difference in time domain model has been developed to study the diffusion through the representative element consisting of cement matrix and aggregates. The model has been validated with existing experimental results. Numerical relationships are established between diffusion coefficients with different casting parameters of concrete. It is observed that the net porosity and the aggregate ratio has a higher significance on the diffusion coefficient than the size and arrangement of aggregates and the ITZ. The study facilitates analysis of pore structures for diffusivity and durability of concrete to achieve improved lifecycle performance.
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