Abstract
The “quality” of the microstructure of concrete is decisive for the properties including the durability. It is therefore important to understand the principles and reactions involved in its formation. In modelling these reactions our perception is expressed in precise mathematical equations describing the system, and the ability of the models to predict outcomes of experiments is a measure of how well the system is understood. The microstructure of concrete can be modelled on different scales from mm-scale to nm-scale. In some cases it is sufficient to describe the systems as homogeneous; in other cases it has to be conceived as consisting of localized reactions. The more fundamental knowledge we have, the more precisely the model can describe the system. However, this does not mean that the model necessarily has to operate on a very detailed level. It depends on the intended purpose of the model and on the fruitfulness of the concepts used. The application of concepts from percolation models on ASR and chloride penetration are used as examples.
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Johansen, V., Thaulow, N. (1996). At What Scale do Homogeneous Phenomena Become Localized: The Necessary and Sufficient Magnification. In: Jennings, H., Kropp, J., Scrivener, K. (eds) The Modelling of Microstructure and its Potential for Studying Transport Properties and Durability. NATO ASI Series, vol 304. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8646-7_3
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DOI: https://doi.org/10.1007/978-94-015-8646-7_3
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