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Long
before modern power plants began producing coal fly ash, Roman
builders turned
to volcanic ash to harness the power of pozzolans.
In
fact, the term “pozzolana”
is derived from the name of an Italian city — Pozzuoli
— that is
regarded as the birthplace of ash concrete technologies. Famed Roman
structures
such as the Pantheon and Colosseum, as well as many roads and
aqueducts, are
still standing over 2,000 years after their construction — in
part because of
the durability of their ash-based concrete.
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