Reference: E.J. Garboczi and D.P. Bentz, Multi-scale picture of concrete and its transport properties: Introduction for non-cement researchers, National Institute of Standards and Technology Internal Report 5900 (1996).

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## Summary of concrete modelling for non-cement researchers

##### ** ABSTRACT**

Concrete is a multi-length scale composite material. From the nanometer to
the millimeter scale, it is a random composite, and a different random
composite at each length scale. Percolation processes play a key role in
the microstucture of concrete, and help to describe the overall dependence
of transport properties like ionic diffusivity on the microstructure.
Computer models have been developed to describe the microstructure and
transport properties, as the randomness of the material precludes most (but
not all) analytical formulations. The overall description of concrete,
over six orders of magnitude of length scales, in terms of computer models,
percolation theory, and composite ideas is of interest to those studying
other random materials as well, like ceramics and rocks. This report is
written to present the ideas for concrete in such a way so as to be acessible
to the non-cement researcher. It is hoped that these ideas will prove to be
useful in other materials.

** Keywords:** Building technology, cement paste, computer modelling, concrete, microstructure,
mortar, percolation, transport properties.