INGREDIENTS OF CEMENTS AND ITS FUNCTIOS

COMPOSITION OF ORDINARY CEMENT




Composition of ordinary cement

The ordinary cement contain two main ingredients for argillaceous and calcareous. in argillaceous materials the clay predominates and in calcareous materials the calcium carbonate predominates.

The ordinary cement contents ratios

Ingredient
Percent
Lime                                  Cao
62
Silica                                 SiO2
22
Alumina                             Al2O3
05
Calcium sulphate              Caso4
04
Iron oxide                         Fe2o3
03
Magnesia                           MgO
02
Sulphur                               S
01
Alkalies
01
                  Total
            100

Functions of ingredients of cement

Lime (cao)

This is the very important ingredients of cement .proportion of lime is carefully maintained .because the excess of lime make the cement soundness and make the cement expand .at the same  time ,if the lime is deficiency , the strength of the cement is decreased and its cause cement set to quickly

Silica (sio2)

Silica is also important  component of cement .its give more strength to cement due to formation of di-calcium and tri-calcium silicates .if the silica is live more content in cement it caused the cement strength less .but at the same time its setting time is increased

Alumina (Al2o3)

Alumina is used to quick setting time of cement .it act as a flux and it lower the clinkering temperature  temperature is the essential for the cement .other hand live of excess of alumina it cause weakens of cement

Calcium sulphate (Caso4)

The ingredients is the form of gypsum and its function is to increase the initial setting time of cement.

Iron oxide (fe2o3)

Iron oxide is to provide the color of cement .also this is used to increase the strength and hardness of 
cement.

Magnesia (Mgo)

Magnesia is present in very small amount of cement. It impart hardness and  colour to the cement .high amount of magnesia make the cement soundness.

Sulphur  (s)

Very small amount of sulphur is make cement sound. High amount of sulphur make the cement soundness so the proportion of sulphur  is very carefully maintained

Alkalies

Cement have very small amount of alkalies .if they present in excess it cause the many troubles such as alkali aggregate reaction ,efflorescence and straining when used in concrete ,bricks or mortar .


ALSO READ---CLASSIFICATION OF CEMENTS 

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