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Why Roman concrete is still stronger than RAAC (and other modern concretes)
(www.chemistryworld.com)
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I remember finding this Practical Engineering video on Roman concrete to be informative: https://youtu.be/qL0BB2PRY7k?si=5exDGyEK_LTfGNOy
Veritasium also has a chapter on ancient concrete in this video: https://youtu.be/rWVAzS5duAs?si=EJ8rPDTPHlq90kgW
My memory is fuzzy, but I think some of the details are:
Definitely see the other comments here about survivorship bias, and higher demands on modern structures.