https://www.archdaily.com/995025/is-roman-concrete-self-healing-research-reveals-the-reason-for-its-long-lasting-durability?ad_campaign=special-tag
There is a self-healing reaction of the cracks inside the cement, which occurs spontaneously and indefinitely.
roman concreteself healingresearchrevealsreason
https://www.cnn.com/2025/12/19/science/roman-concrete-recipe-process-pompeii
Dec 19, 2025 - Excavations of an ancient construction site in Pompeii have revealed the process of how Romans mixed their self-healing concrete.
ancient pompeiiconstruction siterevealsprocesscreating