What was in ancient Greece cement?

Answer 1

In ancient Greece, the term "cement" generally referred to a mixture of lime and volcanic ash, known as pozzolana, which created a hydraulic binder. This combination allowed for the production of concrete that could set underwater, facilitating the construction of durable structures like aqueducts and harbors. The Greeks used this material in various monumental buildings, showcasing advanced engineering techniques. Their understanding of cement laid the groundwork for later developments in Roman concrete technology.