Question

Name the important raw materials used in the manufacturing of cement.

Answer 1

Answer:

The raw material used for manufacturing of cement are :

➡️Lime stone : { CaCO₃ } It provides calcium oxide {CaO }. Cement containing excess of CaO cracks on setting. If CaO is less than required, cement is weak in strength.

➡️Clay : { Al₂O₃ . 2SiO₂ . 2H₂O } It provides alumina and silica {SiO₂}.

➡️Gypsum : {CaSO₄ . 2H₂O} It regulates sitting time of cement. Excess of Al₂O₃ makes the setting of cement quick while, when SiO₂ is present in excess, cement sets slowly.

Answer 2

Answer:

Raw materials used in manufacturing of cement are – limestone, silica, alumina, gypsum.