TIL: Ancient Romans Used Concrete That Can Repair Itself
Today I learned that some ancient Roman buildings have survived for nearly 2,000 years because the concrete they used can naturally seal small cracks over time. For decades, researchers believed volcanic ash was the secret behind Roman concrete’s incredible durability. More recent studies found that the Romans also mixed in chunks of quicklime. When tiny cracks formed and water entered, those lime fragments reacted and helped create new minerals that sealed the cracks before they could grow larger. This is one reason structures like the Pantheon and many Roman harbors have endured centuries of earthquakes, storms, and changing climates while some modern concrete begins to deteriorate after only a few decades. Scientists are now studying this ancient technique in hopes of developing stronger, longer-lasting, and more sustainable concrete for modern construction. It’s a reminder that some of history’s greatest engineering innovations are still teaching us new lessons today. Source:...