Paper Title:
Application of Micromechanics on Alkali-Activated Materials
  Abstract

Research of alkali-activated materials has been a traditional domain of chemists. This paper exploits contribution of micromechanics to the subject. A new model for volumetric evolution of chemical phases is formulated. The first homogenization level identifies elasticity on the scale of N-A-S-H gel. Nanoindentation sensing technique yielded the intrinsic Young's modulus of N-A-S-H gel as ~18 GPa, which was further downscaled to the solid gel particles. Percolation theory had to be introduced to match an early-age elasticity. The second homogenization level takes into account an unreacted fly ash. Homogenization models match well the experimental elasticity and demonstrate stiffening of N-A-S-H gel, induced by increasing packing density of the solid gel particles. The percolation model explains a long setting time of alkali-activated materials.

  Info
Periodical
Edited by
Pietro VINCENZINI and Cristina LEONELLI
Pages
75-85
DOI
10.4028/www.scientific.net/AST.69.75
Citation
V. Šmilauer, F. Škvára, J. Němeček, L. Kopecký, P. Hlaváček, "Application of Micromechanics on Alkali-Activated Materials", Advances in Science and Technology, Vol. 69, pp. 75-85, 2010
Online since
October 2010
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Price
$32.00
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