CEMENT MODULES

Origin of cement modulus:

Even though Portland cement was manufactured by practical experience and process, when you see the chemical analysis, there exists a relation between the percentages of lime with the percentages of combination of silica, alumina and iron oxides.

The oxide ratios was later developed into formulas called kilnrefractory.com/high-alumina-cement

modulus.

Lets discuss some important modulus by which we can mange any cement divison.

More the silica ratio, then lesser the coating tendency in kiln due to low liquid formation resulting hard burning of clinker with increase in fuel consumption, also causes slow setting and slow hardening of cement.
Also increase in silica modulus causes cement to have a property of increase in resistance to chemical and atmospheric attack and a higher strength.

Lesser the silica ratio, then more the liquid formation and coating tendency in kiln and improves good burnability of clinker with less fuel consumption.
A decrease in silica ratio causes increase in liquid content in rawmix.Thus a low silica ratio rawmix burns easily and quickly in shorter time resulting good nodulisation of clinker.

Hydraulic modulus was not used in most of the cement plants nowadays as only lime saturation factor, alumina modulus and silica modulus are used mostly. After the discovery of lime saturation factor, the usage of hydraulic modulus was declined as hydraulic modulus not applies for varying conditions and materials under modern cement manufacturing process.