Table 2. Oxide analysis and physical...

Table 2.

Oxide analysis and physical properties of materials

	Cement	FA	Silica sand
Chemical analysis: wt%
Silicon dioxide (SiO₂)	19.9	52.7	98.8
Aluminium oxide (Al₂O₃)	4.8	26.6	0.21
Ferric oxide (Fe₂O₃)	3.1	5.6	0.09
Potassium oxide (K₂O)	ND^a	ND	0.03
Calcium oxide (CaO)	62.4	2.4	ND
Magnesium oxide (MgO)	2.2	1.2	ND
Sodium oxide (Na₂O) equivalent	0.54	1.7	ND
Sulfur trioxide (SO₃)	3.0	0.3	ND
Free calcium oxide	ND	0.03	ND
Total phosphates	ND	0.5	ND
Loss on ignition	ND	<2.0	0.14
Physical properties
Specific gravity	3.15	2.20	2.65
Surface area: m²/kg	375	1300	ND
Fineness: % retained on 25 μm sieve	ND	<25	ND
Cumulative amount retained: %
500 μm	ND	ND	0.1
355 μm	ND	ND	0.5
250 μm	ND	ND	1.5
180 μm	ND	ND	6.0
125 μm	ND	ND	46.0
90 μm	ND	ND	83.0
63 μm	ND	ND	96.5

	Cement	FA	Silica sand
Chemical analysis: wt%
Silicon dioxide (SiO₂)	19.9	52.7	98.8
Aluminium oxide (Al₂O₃)	4.8	26.6	0.21
Ferric oxide (Fe₂O₃)	3.1	5.6	0.09
Potassium oxide (K₂O)	ND^a	ND	0.03
Calcium oxide (CaO)	62.4	2.4	ND
Magnesium oxide (MgO)	2.2	1.2	ND
Sodium oxide (Na₂O) equivalent	0.54	1.7	ND
Sulfur trioxide (SO₃)	3.0	0.3	ND
Free calcium oxide	ND	0.03	ND
Total phosphates	ND	0.5	ND
Loss on ignition	ND	<2.0	0.14
Physical properties
Specific gravity	3.15	2.20	2.65
Surface area: m²/kg	375	1300	ND
Fineness: % retained on 25 μm sieve	ND	<25	ND
Cumulative amount retained: %
500 μm	ND	ND	0.1
355 μm	ND	ND	0.5
250 μm	ND	ND	1.5
180 μm	ND	ND	6.0
125 μm	ND	ND	46.0
90 μm	ND	ND	83.0
63 μm	ND	ND	96.5

Not determined

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