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Gypsum is added to cement because...

Gypsum is added to cement because

A

it makes the cement very hard

B

it increases the pace of setting of cement

C

it slows down the initial setting of cement when water is added

D

none of the above

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Gypsum**: Gypsum is a mineral with the chemical formula CaSO4·2H2O. It is composed of calcium sulfate dihydrate. 2. **Role of Gypsum in Cement**: Gypsum is added to cement during the manufacturing process. Its primary function is to control the rate of hardening of the cement. 3. **Setting Time of Cement**: When water is added to cement, it begins to set and harden. Without gypsum, cement would set too quickly, making it difficult to work with before it hardens. 4. **Importance of Controlled Setting**: By adding gypsum, the initial setting time of the cement is slowed down. This allows for better workability and placement of the cement in construction projects. 5. **Conclusion**: Therefore, gypsum is added to cement to control the setting time and prevent it from hardening too quickly, ensuring that it can be used effectively in construction. **Final Answer**: Gypsum is added to cement to control the rate of hardening and to slow down the initial setting time. ---
**Step-by-Step Solution:** 1. **Understanding Gypsum**: Gypsum is a mineral with the chemical formula CaSO4·2H2O. It is composed of calcium sulfate dihydrate. 2. **Role of Gypsum in Cement**: Gypsum is added to cement during the manufacturing process. Its primary function is to control the rate of hardening of the cement. 3. **Setting Time of Cement**: When water is added to cement, it begins to set and harden. Without gypsum, cement would set too quickly, making it difficult to work with before it hardens. ...
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Assertion Gypsum is added to cement to increase its rate of setting. Reason Gypsum is calcium sulphate hemihydrate.

Gypsum is heated .

Gypsum is added to portland cement 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. Gypsum is added to portland cement

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. Setting of cement is

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

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. Concrete is a mixture of