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Question
Which compound of cement is reponsible for strength of cement?
lhesaV dh lkeF;Z ds fy, lheasV dk dkSu lk ;kSfxd mÙkjnk;h gS\ 
A.
Magnesium oxide
B.
Silica
C.
Alumina
D.
Calcium sulphate
Answer ( Option B)

Silica

Solution

Compounds of cements :
• Lime(CaO) (62 – 67%) → Responsible for soundness + strength
• Silica(SiO2) (17 – 25%) → impart strength
• Alumina(Al2O3) (3 – 8%)→ impart quick setting property.
• Calcium sulphate (CaSO4) (3 – 4%) → as a gypsum increases setting time of cement
• Oxides of Iron(Fe2O3) (3 – 4%) → Impart colour, hardness, & strength
• Magnisia(MgO) (1 – 2%) → Impart colour, hardness & soundness
• Sulpher (1-3%) → soundness 
• Alkalies (<1%) → accelerate setting of cement
Alkali is undesirable impurity which gives aggreagate reaction, efflorescence, staining of structure etc.

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