Abstract
High strength geopolymers were produced from coal combustion fly ashes. These matrices
 reached compressive strength values over 100 MPa, much stronger and denser than
 obtained by using Portland Cement binders. Size fractions were obtained by size separation
 techniques and the relationship between strength and particle size was investigated. The
 differences in compressive strength measured in the geopolymers made from fine fractions,
 the original fly ash and a coarse fraction of the same ash, were not significantly higher than
 the variation found for a reference geopolymer material. Therefore, a direct size-strength
 relationship could not be proven. Moreover, the chemistry and the pH of the fractions also
 varied, and this might as well has played a role in the strength development.
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