Researchers Uncover the Secret Ingredient to Roman Mortar’s Strength

why has Roman cement lasted so long
Hadrian’s Wall in Rome

The Washington Post published an article explaining the secret to ancient Rome’s long-lasting mortar recipe. Turns out the secret to enduring 2,000 years of earthquakes and floods is volcanic sand, which allowed for formation of clusters of a mineral known as str√§tlingite. These mineral crystals, Tformed because of a reaction that took place over time between the lime and volcanic matter in the mortarhelped the concrete withstand cracking.