Question

Which of the following is not present in portland cement?

• A. $C{a}_{3}A{l}_2{O}_6$
• B. $C{a}_{3}Si{O}_5$
• C. $C{a}_{2}Si{O}_4$
• D. $C{a}_3(P{O}_4{)}_2$

Answer 1

The correct option is D $C{a}_3(P{O}_4{)}_2$

• 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-

1. $C{a}_{3}A{l}_2{O}_6$
   
2. $C{a}_{3}Si{O}_5$
   
3. $C{a}_{2}Si{O}_4$
   
4. $N{a}_{2}O$
5. $K_{2}O$
6. $CaS{O}_4.2H_{2}O$
   
7. $C{a}_{4}A{l}_{2}F{e}_2{O}_{10}$
   

• Hence option D is not present in portland cement.