In the presence of Ca2? ions, fluidized fly ash exhibits higher pozzolanic activity than conventional fly ash [11]. One may expect that, for the sake of its chemical composition, fluidized fly ash will react in hydrating aluminate cement system in similar way as Portland cement. Thereby, fluidized
fly ash may be considered as potential additive limiting the aluminate conversion (like conventional fly ash) as well as substitute of Portland cement in quickly hardening or expansive binder.