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-Romans found an extra ingredient to add to their cement

-Pozzolana, a fine-grained volcanic sand, which would resist wear and abrasion better than soft lime and gravel

-Many structures made by this concrete are still used to this day

-The Pozzolana concrete is actually much more stable and less environmentally damaging than today's Portland blend

Roman Concrete (Pozzolana)

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Roman Infrastructure

By Caleb Harris