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Multi-Scale Digital-Image-Based Modelling of Cement-Based Materials

Published online by Cambridge University Press:  21 February 2011

D.P. Bentz,
E.J. Garboczi,
H.M. Jennings and
D.A. Quenard
D.P. Bentz
Affiliation:
Building and Fire Research Laboratory, Building 226, Room B-350, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
E.J. Garboczi
Affiliation:
Building and Fire Research Laboratory, Building 226, Room B-350, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
H.M. Jennings
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
D.A. Quenard
Affiliation:
Centre Scientifique et Technique du Batiment, Saint-Martin d'Heres, FRANCE
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Abstract

Computer modelling of the properties and performance of cement-based materials is complicated by the large range of relevant size scales. Processes occurring in the nanometersized pores ultimately affect the performance of these materials at the structural level of meters and larger. One approach to alleviating this complication is the development of a suite of models, consisting of individual digital-image-based structural models for the calcium silicate hydrate gel at the nanometer level, the hydrated cement paste at the micrometer level, and a mortar or concrete at the millimeter level. Computations performed at one level provide input properties to be used in simulations of performance at the next higher level. This methodology is demonstrated for the property of ionic diffusivity in saturated concrete. The more complicated problem of drying shrinkage is also addressed.

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References

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