During late antiquity, concrete all but vanished from the Mediterranean world, and would not be used widely again until the twentieth century. This video explains why.
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Chapters:
0:00 Introduction
0:39 Understanding Roman concrete
1:29 Early experiments
2:25 The apogee
3:33 Squarespace!
4:19 Geographic limits of Roman concrete
5:00 The decline of concrete
6:28 Final notices
7:26 Not forgotten, but gone

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