# 1,900-Year-Old Latrine Reveals Secrets of Roman Concrete's Durability

Researchers analyzed the chemical composition of a 1,900-year-old Roman latrine to uncover why ancient Roman concrete has resisted decay for millennia. They found that the use of lime clasts and specific volcanic materials created self-healing properties. This discovery could lead to more durable and sustainable modern concrete.

**Importance:** 3/5

## Sources

### Technology
- [Hacker News](https://www.smithsonianmag.com/smart-news/how-has-roman-concrete-lasted-for-millennia-a-1900-year-old-latrine-offers-new-clues-about-the-materials-impressive-durability-180989115/) — Fri, 17 Jul 2026 03:48:26 +0000