A Millennia-Old Mystery
Roman concrete is renowned for its robustness. While modern constructions often crumble within a century, Roman structures like roads, aqueducts, and buildings have stood for nearly 2,000 years. How did they achieve this feat?
The Secret to Durability
Scientists have long believed that Roman concrete's longevity was mainly due to the pozzolanic reaction—a chemical interaction between volcanic ash, lime, and water. However, a new study led by a team from the University of California, Berkeley, published in Science Advances in July 2026, reveals that another chemical process, carbonation, also plays a crucial role.
An Ancient Latrine as a Laboratory
To explore this phenomenon, researchers turned to Hadrian’s Villa, a UNESCO World Heritage site located about 17 miles east of Rome. Among its architectural treasures, a communal latrine offers a unique opportunity: to study Roman concrete in its original state, untouched by modern alterations. According to Paulo J. M. Monteiro, civil engineer and co-author of the study, “nobody restores a latrine.” Thus, the material has remained unchanged for 19 centuries.
Study Findings
By analyzing a concrete sample taken from beneath a toilet seat, researchers discovered that carbonation helped seal cracks in the concrete over time. This chemical process involves the reaction between carbon dioxide in the air and the concrete, forming limestone minerals that reinforce the structure.
Implications for Modern Concrete
These findings could revolutionize the modern construction industry. By incorporating processes similar to carbonation in today's concrete, we could produce more durable and environmentally friendly materials. This is especially relevant in a context where sustainability and carbon emission reduction are crucial.
Paving the Way for the Future
Concrete, the building material par excellence, is responsible for 8% of global CO2 emissions. Improving its durability not only extends the life of structures but also reduces the need for new production, thereby contributing to emission reduction.
By drawing inspiration from the past, we have the opportunity to improve our future. Interested in how these insights can apply to your project? Let's discuss your project in 15 minutes.