Name the important raw materials used in the manufacturing of cement.
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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.
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26
Answer:
Raw materials used in manufacturing of cement are – limestone, silica, alumina, gypsum.
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