- Author
-
Garboczi, E. J.
|
Bentz, D. P.
- Title
- Concrete: A Multi-Scale Interactive Composite.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- Interfacial Transition Zone in Cementitious Composites. International RILEM Conference. Proceedings 35. March 8-12, 1998,
E&FN Spon, London, England,
Haifa, Israel,
Katz, A.; Bentur, A.; Alexander, M.; Arliguie, G., Editors,
43-50 p.,
1998
- Keywords
-
concretes
|
diffusivity
|
interfacial transition zone
|
multi-scale
- Abstract
- Methods have been developed for predicting the overall diffusion coefficient of concrete using a multi-scale interactive analysis. The analysis makes use of microstructure models of mortar/concrete and cement paste at the scales of millimeters and micrometers, respectively, when comparing experimental data to model results, one must be careful to consider the differing w/c ratio and degree of hydration of the interfacial transition zone (ITZ) and bulk paste regions, relative to a cement paste specimen containing no aggregates. The amount of aggregates influences the amount and properties of these two cement paste phases, leading to the designation of concrete as an interactive composite. The multi-scale analysis presented in this paper can quantitatively take this interaction of aggregates and cement paste into account when understanding the microstructure of concrete. The analysis predicts that the contrast in diffusivity between the ITZ and the bulk cement paste is a function of the degree of hydration.