這篇文章說,羅馬混凝土裏麵有生石灰,這樣出現裂縫進水後,生石灰遇水有自我補救的功能。
https://www.scientificamerican.com/article/ancient-roman-concrete-has-self-healing-capabilities/
Mineral deposits called “lime clasts” found in ancient Roman concrete give the material self-healing capabilities