Question

Portland cement is composed of four major oxides (CaO, SiO2, Al2O3, Fe2O3 ≥90%).

(a) True

(b) False

I got this question in class test.

Question is from Chemical Composition Test in division Types of Cement and Testing of Cement of Concrete Technology

Answer 1

The correct answer is:

(a) True

Portland cement is primarily composed of four major oxides: calcium oxide (CaO), silicon dioxide (SiO₂), aluminum oxide (Al₂O₃), and iron oxide (Fe₂O₃), which together make up more than 90% of the composition of Portland cement. These oxides are responsible for the cement's strength and its ability to bind aggregates in concrete.