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Roman concrete outlasts modern reinforced concrete by a factor of thirty. New research on the Pantheon's self-healing chemistry suggests the reason is not what engineers assumed.
The Pantheon's unreinforced concrete dome has stood for nearly 1,900 years, while steel-reinforced modern bridges are considered aged at 50. The gap is not a rounding error; it is a chasm that recent research is only now beginning to explain.
For decades, scientists blamed volcanic ash or sloppy Roman mixing for the strange white flecks in ancient concrete. New work argues those flecks are the whole point — a slow-release repair system that heals cracks automatically.
The Pantheon endures not because it was built stronger, but because it was built to absorb damage rather than resist it. Modern construction has largely forgotten that durability was ever a design choice rather than a maintenance schedule.
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