What Exactly Is Concrete?  Join us today as we learn about the not-so-modern building material--concrete.

Sources:

https://www.concrete.org/topicsinconcrete/topicdetail/history%20of%20concrete?search=history%20of%20concrete

https://www.concretenetwork.com/concrete-history/

https://www.nachi.org/history-of-concrete.htm

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