What did the first civilizations use for concrete?
Answer Mud and straw
As early as 3,000 B.C.E., tribes used mud and straw to reinforce shelters and make them less permeable to the elements, predators and other humans. This kind of style is considered "adobe" by today's definition and is the first concrete-like material used by early man.
Asked by Jennifer Sinclair · Last updated 5 years ago · 8.2K views · SOURCE
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