Ancient Roman concrete could self-heal thanks to “hot mixing” with quicklime | Ars Technica
https://arstechnica.com/science/2023/01/ancient-roman-concrete-could-self-heal-thanks-to-hot-mixing-with-quicklime/
Riddle solved: Why was Roman concrete so durable? | MIT News | Massachusetts Institute of Technology
https://news.mit.edu/2023/roman-concrete-durability-lime-casts-0106
Why Roman concrete outlasts its modern counterpart - CNN Style
https://www.cnn.com/style/article/roman-concrete-mystery-ingredient-scn/index.html