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Write composition of portland cement.

written 4.5 years ago by teamques10 ★ 70k

modified 3.9 years ago by pedsangini276 • 4.8k

engineering chemistry

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written 4.5 years ago by teamques10 ★ 70k

Portland cement is manufactured from:

1. Calcareous materials, CaO (such as limestone, chalk, marl)
2. Argillaceous materials, Al2O3 & SiO2 (such as clay, shale, slate)
3. Powdered coal or fuel oil
4. Gypsum (CaSO4.2H2O)

The average composition of the final product is as follows:

Component	Percentage range by mass
Lime (CaO)	60-69
Silica (SiO2)	17-25
Alumina (Al2O3)	3-8
Iron Oxide (Fe2O3)	2-4
Magnesium Oxide (MgO)	1-5
Sulphur trioxide (SO3)	1-3
Alkali Oxides (Na2O + K2O)	0.3-1.5

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