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Gypsum is added to portland cement to...

Gypsum is added to portland cement to

A

fasten the process of setting

B

slow down the process of setting

C

improve the colour of the cement

D

increase the melting point of cement.

Text Solution

Verified by Experts

The correct Answer is:
B
Gypsum slows down the process of seeing of the cement so that it gets sufficiently hardened.
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Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. Gypsum is added to portland cement

Gypsum is heated .

Assertion Gypsum is added to cement to increase its rate of setting. Reason Gypsum is calcium sulphate hemihydrate.

Gypsum is added to cement because

The addition of gypsum to portland cement helps in :

Which of the following statements with regard to Portland cement are correct? 1. Silica imparts strength to cement. Alumina makes the cement quick setting 3. Excess of lime increases the strength of cement. 4. Calcium sulphate decreases the initial setting time of cement. Select the correct answer using the code given below :

Gypsum (CaSO_4. 2H_2O) is added to clinker during cement manufacturing to

Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. Portland cement does not contain

Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. The percentage of lime in portland cement is approximately