Composition of Cement clinker

The various constituents add happening in virtually fire and form gum clinker. The compounds formedin the in relation to fire process have the properties of feel and hardening in the presence ofwater.They are known as Bogue compounds after the say of Bogue who identified them. These compounds are as follows: Alite (Tricalcium silicate or C3S), Belite (Dicalcium silicate or C2S), Celite (Tricalciumalluminate or C3A) andFelite (Tetracalciumalumino ferrite or C4AF).

Tricalcium silicate

It is supposed to be the best cementing material and is adroitly burnt fix.It is very roughly 25-50% (normally practically 40 per cent) of gum. It renders the clinker easier to scuff down,increases resistance to deadening and thawing, hydrates rapidly generating high heat and developsan into the future hardness and strength. However, raising of C3S content greater than the specified limitsincreases the heat of hydration and solubility of paste in water. The hydrolysis of C3S is mainly held responsible for 7 daylight strength and hardness. The rate of hydrolysis of C3S and the character of gel developed are the main causes of the hardness and in the future strength of secure paste. The heat of hydration is 500 J/g.

Dicalcium silicate

It constitutes roughly 25-40% (normally about 32 per cent) of gum. It hydrates andhardens slowly and takes long era to cumulative to the strength (after a year or more). It impartsresistance to chemical forcefulness. The hydrolysis of C2S proceeds slowly. At ahead of time ages, less than a month, C2S has tiny confrontation up strength and hardness. While after one year, its contribution to the strength and hardness is proportionately on the subject of equal to C3S. The heat of hydration is 260 J/g.

Tricalciumalluminate

It is not quite 5-11% (normally roughly 10.5 per cent) of gum. It rapidlyreacts taking into account water and is answerable for flash set of finely stuck clinker. The vivaciousness ofaction is regulated by the adjoin of 2-3% of gypsum at the period of grinding pin. The heat of hydration of 865 J/g.

Tetracalciumalumino ferrite

It constitutes about 8 to 14% (normally more or less 9 per cent) of gum. It has poorest cementing value. Raising theC4AF content reduces the strength slightly. The heat of hydration is 420 J/g.