Table 2.

Chemical composition of fluidized bed combustion fly ashes (FBC I, FBC II, FBC III) and siliceous fly ashes (CFA).

Ingredient	FBC I	FBC II	FBC III	CFA	CEM I 42.5R
LOI	2.39	4.03	5.71	1.81	2.57
SiO2	39.37	43.78	35.87	40.20	19.79
Fe2O3	3.89	4.57	9.73	2.00	2.98
Al2O3	32.77	21.09	22.69	6.00	5.76
CaO	10.67	15.92	16.01	43.20	62.28
MgO	1.44	1.61	1.88	4.70	1.71
SO3	3.09	4.68	4.07	0.10	2.62
Na2Oeq	1.22	0.75	1.02	-	0.75
Specific surface area acc. to Blaine [cm2/g]	8750	8230	7870	3800	4000
FBC I—fluidized bed combustion fly ash from lignite combustion in power plant I FBC II—fluidized bed combustion fly ash from hard coal combustion in power plant II FBC III—fluidized bed combustion fly ash from hard coal combustion in CHP plant III CFA—conventional fly ash from power plant III CEM I 42.5R—Portland cement CEM I 42.5R