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How many years did it take the modern engineers to figure out how the roman concrete was made out of?

How many years did it take the modern engineers to figure out how the roman concrete was made out of?
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How many years did it take the modern engineers to figure out how the roman concrete was made out of?

User Siddhesh
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It wasn't known until 1860 so I hope that helps!
User Joe Wicentowski
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