Application of Micromechanics on Alkali-Activated Materials

Abstract:

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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.

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Periodical:

Edited by:

Pietro VINCENZINI and Cristina LEONELLI

Pages:

75-85

DOI:

10.4028/www.scientific.net/AST.69.75

Citation:

V. Šmilauer et al., "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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$35.00

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