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Multitechnique Approach to Understanding the Microstructure of Cement-Based Systems

Published online by Cambridge University Press:  21 February 2011

David L. Cocke,
M. Yousuf,
A. Mollah,
R. K. Vempati and
T. R. Hess
David L. Cocke
Affiliation:
Gill Chair of Analytical Chemistry, Lamar University, Beaumont, TX 77710
A. Mollah
Affiliation:
Visiting Professor, Department of Chemistry, Dhaka University, Bangladesh
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Abstract

The chemistry of cement, its hydration and the development of microstructure in cement-based systems is extremely complex, and it becomes even more complex in the presence of additives. The elucidation of the mechanisms of these processes is a challenging problem and requires the applications of multiple techniques including the latest microscopic methods. The applications of molecular spectroscopies, surface spectroscopies and microscopies have helpeddevelop models and mechanisms for the retardation of cement setting by Zn, Cd and Pb, the chemical and structural effects of superplasticizers, and the interaction of hydrating cement with aggregates, selective sorbents and fillers. The results of these studies indicated that the inhibition of hydration is controlled by dispersion of various charges present in hyperalkaline solution in cement paste. According to this charge dispersal model, the Ca2+ ions from initial hydration form a tightly-bound bilayer with the negatively charged C-S-H surface. Consequent to this intrinsic process, the metalhydroxy or superplasticizer anions immediately surround the bilayer to constitute a trilayer which inhibits further hydration.

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