Table 1.

Chemical analysis of the used materials (wt.%).

Oxide	CEM I	Red Mud	Fly Ash	Slag	Clay	Limestone
SiO2	19.3	21.9	55.3	41.6	62.4	20.2
Al2O3	4.9	16.9	19.7	12.8	21.3	4.3
Fe2O3	2.9	37.9	9.0	6.0	7.3	1.4
CaO	64.0	10.0	8.3	33.5	2.2	71.6
MgO	1.8	0.6	2.9	6.0	1.8	1.7
SO3	2.8	0.2	1.4	1.6	0.1	0.1
Na2O	0.2	7.2	0.7	1.4	1.5	<0.01
K2O	0.8	0.2	1.7	0.6	2.5	0.1
P2O5	-	0.5	0.4	0.01	0.4	0.4