Sodium Sulphate Effect on Cement Produced with Building Stone Waste

Table 2

The chemical composition of the clinker and the supplementary cementing materials.

Chemical composition	Amount (%)
	Clinker	Pumice	Fly ash	Diatomite	Andesite	Marble	Limits
SiO2	21.01	60.50	53.23	85.50	57.1	0.67
Al2O3	4.64	17.15	19.34	4.37	15.9	0.34
Fe2O3	4.24	3.38	10.21	1.33	5.00	0.19
CaO	65.96	4.68	4.42	1.51	4.90	53.01
MgO	2.44	2.09	0.88	0.29	3.20	1.16	<5
K2O	0.91	4.54	2.85	0.75	6.40	—
SO3	1.93	0.16	0.13	0.20	—	—	<5
Na2O	—	4.30	0.55	0.70	4.50	—
P2O5	0.08	—	—	—	0.18	—
Cl	0.033	—	0.005	—	—	—	<0.1
S + A + F	29.89	81.03	82.78	91.20	78.0	1.2	>70
Loss on ignition		2.64	8.30	2.74	0.15	—	<5