question_answer

Which one of the following is not contained 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)  \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\]