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Summary

This paper has described a multi-scale model for predicting concrete diffusivity based on the amounts and sizes of the concrete components. This model has three key steps, using (1) a millimeter-scale concrete microstructure model, (2) a micrometer-scale cement paste microstructure model, and (3) a diffusivity calculation of the concrete microstructure model. The two main results of this paper are that the large computer simulations that were previously necessary for steps (1) and (3) can now be accurately replaced with simple analytical equations, making the multi-scale model easier and faster to use.