Abstract
Abstract This paper proposes a non-homogeneous numerical model to describe the two-dimensional diffusion-reaction behaviour of sulphate ions, associated with cement-based systems containing aggregates. It is based on Fick’s second law of diffusion and reaction kinetics, and the tensile constitutive law. A bi-directional walking method is adopted to take into account the presence of aggregates, distributed stochastically. The results confirm that the diffusion-reaction behavior of sulphate ions can be effectively obstructed by introducing aggregates into the cementitious system. This model conclusively reveals that a larger aggregate size and greater aggregate fraction together help contain the sulphate ingression and any subsequent cracking.
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