Excerpt:
History of Concrete
Timeline
Ancient Egypt
Egyptians used calcinated gypsum to give brick or stone structures a smooth coating.
Ancient Greece
A similar application of calcinated limestone was used by the ancient Greeks.
Ancient Rome
The Romans frequently used broken brick aggregate embedded in a mixture of lime putty with brick dust or volcanic ash. They built a wide variety of structures that incorporated stone and concrete, including roads, aquaducts, temples and palaces.