The Pantheon is the world's largest unreinforced concrete dome, standing for nearly 2,000 years.
Roman concrete's durability is partly due to pozzolanic ash, which includes volcanic materials.
Lime clasts in Roman concrete enable self-healing capabilities when exposed to water.
Hot mixing techniques allowed Roman concrete to cure faster and produce stronger compounds.
Roman concrete can thrive in seawater, creating tobermorite crystals that enhance durability.
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