Explanation: Portland cement is composed of four major oxides ((CaO, SiO2, Al2O3, Fe2O32O & K2O in P.C. ?
A. =.6%
B. >6%
C. <6%
D. 0
Answer:A
Explanation: Portland cement is composed of four major oxides ((CaO, SiO2, Al2O3, Fe2O32O & K2O in P.C. ?
A. =.6% B. >6% C. <6% D. 0
Explanation: Alkalies (Na2O & K2O) may cause some dificulties if the cement is used with certain types of reactive aggregates in making concrete.