In what context is Pozzolana particularly significant?

Pozzolana is particularly significant because it allowed Roman concrete to set underwater, which was a major advancement in construction technology. This material, composed of volcanic ash, was crucial for the development of hydraulic concrete, which could cure and harden even when submerged. This innovation enabled the Romans to construct impressive marine structures, such as harbors, bridges, and aqueducts, with unparalleled durability and structural integrity. The ability to build underwater expanded the possibilities of engineering and architecture significantly during the Roman era, contributing to their advancements in infrastructure and urban development.

While pozzolana has various applications, such as in sculpture or as a decorative material, its most transformative role was in enhancing the functionality and versatility of concrete, particularly in wet environments.