The major components of cement are,
steel,cement, sand
The components of cement are,C3S - 54.1 %C2S - 16.6 %C3A - 10.8 %C4AF - 9.1 %
The contents in cement is as follows,Tricalcium silicateDicalcium silicateTricalcium AluminateTetracalcium Alumino Ferrite
cement fine aggregates and course aggregates and water for the hydration of cement are the main component of plain cement concrete. and for RCC M-S bars are used with these component.
I consider cement as a heterogeneous mixture.
Portland cement.
Carbohydrates, Fats and Proteins are the major components of food.
There are cement manufacturing plants near almost every major city in the world.
Actually both physical and chemical changes are happening during cement mixing.
The 3 major components of fitness are strength,endurance, and flexibility.
Fish,oil,steel,cement
Hydrated cement produces CaO. So calcium oxide is a major constituent. Silicon dioxide is also produced resulting in calcium silicate.