Pozzolanic Effect on the Hydration Heat of Cements Incorporating Fly Ash, Obsidian, and Slag Additives

Table 2

A summary of oxide analysis of additives utilized in the experiments (%).

Oxides	CEM I 42.5R	Obsidian	Fly ash	Blast furnace slag
CaO	63.52	0.75	3.85	31.23
SiO2	18.48	71.56	51.65	37.58
Al2O3	5.25	12.52	17.65	10.52
Fe2O3	3.48	1.53	11.51	0.63
MgO	1.01	0.17	4.62	8.06
K2O	1.13	5.21	2.05	1.53
Na2O	0.36	3.95	0.65	0.35
P2O5	0.071	0.011	0.112	0.002
SO3	2.775	0.003	1.25	3.57
TiO2	0.13	0.17	0.68	0.41
Sr	0.075	0.012	0.013	0.061
Cr2O3	0.06	0.065	0.11	0.13
MnO	0.25	0.05	0.12	1.25
Loss on ignition	2.76	2.02	2.13	1.12
Reactive silica	-	39.34	47.13	43.01