Abstract
Intensive research has been focused on the exploitation of fly ash, which is the by-product of power plants. It is estimated that 9500000 t/y of fly ash are produced in Greece and only 10% of this amount is exploited in cement and concrete technology. An attractive way to manage the fly ash deposits is their use in geopolymer production. The Solid/Liquid (S/L) ratio – like the W/C ratio of cementitious mixes - is a critical parameter of the geopolymer mix design procedure. In this paper, the effect of the S/L ratio on the properties of fresh and hardened fly ash based geopolymers is studied. It is concluded that the S/L ratio does not significantly affect the setting time and the compressive strength of geopolymers. On the contrary, workability of the fresh geopolymer is greatly affected by the S/L ratio. The studied geopolymers showed comparable mechanical and physical properties with the cements that are standardized in the EN 197-1.
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