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Interior of the Pantheon, an ancient Roman temple built in honor of Roman gods. Constructed of concrete, it features a large dome with an oculus of 43.3 meters (142 ft) in diameter


The Secrets of Ancient Rome’s Buildings

What is it about Roman concrete that keeps the Pantheon and the Colosseum still standing?

An international team of researchers has examined Roman concrete to learn why it has proven to be so durable. A sample of Roman concrete taken from the ancient port of Baiae in Pozzuloi Bay revealed that by mixing lime and volcanic ash for underwater structures, the Romans used the seawater to trigger a chemical reaction that hydrated the lime and mixed with the ash to form a glue that is stronger than what holds modern concrete together.