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Today, concrete is the most widely used human-made material (measured by tonnage).

the perfect passive participle of "concrescere", from "con-" (together) and "crescere" (to grow).

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Many Roman aqueducts and bridges, such as the magnificent Pont du Gard in southern France, have masonry cladding on a concrete core, as does the dome of the Pantheon.

After the Roman Empire, the use of burned lime and pozzolana was greatly reduced until the technique was all but forgotten between 500 and the 14th century.

The cement reacts chemically with the water and other ingredients to form a hard matrix that binds the materials together into a durable stone-like material that has many uses.

Often, additives (such as pozzolans or superplasticizers) are included in the mixture to improve the physical properties of the wet mix or the finished material.

The earliest large-scale users of concrete technology were the ancient Romans, and concrete was widely used in the Roman Empire.

The Colosseum in Rome was built largely of concrete, and the concrete dome of the Pantheon is the world's largest unreinforced concrete dome.German archaeologist Heinrich Schliemann found concrete floors, which were made of lime and pebbles, in the royal palace of Tiryns, Greece, which dates roughly to 1400–1200 BC.During the Roman Empire, Roman concrete (or opus caementicium) was made from quicklime, pozzolana and an aggregate of pumice.The widespread use of concrete in many Roman structures ensured that many survive to the present day.The Baths of Caracalla in Rome are just one example.Modern structural concrete differs from Roman concrete in two important details.

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