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Cement and Concrete

Cement is a gray powder made by grinding stone. It was invented by the Romans for making mortar. They mixed crushed rock with burnt lime to create a sort of flour. Water was added to these particles and as it dried, it strengthened. It had to be kept dry in order to maintain its strength.

Concrete is cement that is mixed with sand, crushed rock or gravel. It solidifies and hardens after mixing with water through a process called hydration. The water reacts with the cement, which bonds the other components together, eventually creating a strong stone-like material. Concrete is cheap and is the most widely used man-made material in the world.

Cement, with nothing mixed inConcrete, with pebbles mixed inCement and Concrete, respectively
As shown above, concrete typically has another material mixed with it to give it a distinct appearance, while cement is usually plain ground stone.
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