Roman Walls - World History Encyclopedia
https://www.worldhistory.org/article/942/roman-walls/
Early Roman WallsWalls During The Republic & EmpireDefensive WallsConclusionConcrete Revolution By the late 3rd century BCE, the Romans revolutionized construction with the invention of concrete. Concrete was developed by experimenting with a type of mortared rubble construction called opus caementicium. It was made by adding a volcanic dust called pozzolana to mortar made of a mixture of brick or rock pieces, lime or gyps...See more on worldhistory.orgExplore further Concrete Revolution By the late 3rd century BCE, the Romans revolutionized construction with the invention of concrete. Concrete was developed by experimenting with a type of mortared rubble construction called opus caementicium. It was made by adding a volcanic dust called pozzolana to mortar made of a mixture of brick or rock pieces, lime or gyps...
Concrete Revolution By the late 3rd century BCE, the Romans revolutionized construction with the invention of concrete. Concrete was developed by experimenting with a type of mortared rubble construction called opus caementicium. It was made by adding a volcanic dust called pozzolana to mortar made of a mixture of brick or rock pieces, lime or gyps...
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