Question

Which of the following is not present in Portland cement?

• A. $Ca _{2} SiO _{4}$
• B. $Ca _{3} SiO _{5}$
• C. $Ca _{3}\left( PO _{4}\right)_{2}$
• D. $Ca _{3} Al _{2} O _{6}$

Answer 1

Answer: (C)

$Ca _{3}\left( PO _{4}\right)_{2}$

Answer 2

Portland cement gets its strength from chemical reactions between the cement and water. The process is known as hydration.
Chemical composition of portland cements are-
$Ca _{3} Al _{2} O _{6}$
$Ca _{3} SiO _{5}$
$Ca _{2} SiO _{4}$
$Na _{2} O$
$K _{2} O$
$CaSO _{4} \cdot 2 H _{2} O$
$Ca _{4} Al _{2} Fe _{2} O _{10}$