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Cement is one of the most important buil...

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

A

20-25%

B

30-45%

C

60-65%

D

40-50%

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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. 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. Concrete is a mixture of

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

Name two important raw materials for the manufacture of cement.

The most important raw materials used in the manufacture of cement are

The main raw materials required for the manufacture of portland cement are

NARAYNA-S-BLOCK ELEMENTS-LEVEL - III
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  2. Setting of cement is an

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  3. Cement is one of the most important building material of the present t...

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  4. Concrete is a mixture of

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  5. Which of the following statement is true?

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  6. Both alkali metals and alkaline earth metals are s-block elements. The...

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  7. The substance not likely to contain CaCO(3) is:

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  8. The drying agent which absorbs carbon dioxide and reacts violently wit...

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  9. Limestone is a naturally occuring form of calcium carbonate. It is use...

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  10. Which of the following groups of elements have properties that are mos...

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  11. yellow phosphorus on reaction with Ca(OH)(2) gives:

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  12. The hydration entahphy of Mg^(2+) ion is higer than that of

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  13. Select the correct statements about barium:

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  14. Which of the following oxides have rock salt structure with coordinati...

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  15. The pH of buffer of NH4OH + NH4Cl - type is given by -

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  16. Which one is the active constituent of bleaching powder?

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  17. A sodium salt of unknown anion when treated with MgCl(2) gives a white...

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  18. Magnesium is an important component of which biomolecule occuring exte...

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  19. MgSO(4) on reaction with NH(4)OH and Na(2)HPO(4) forms a white crystal...

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  20. Which one of the following alkaline earth metal sulphates has its hydr...

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