While earlier civilizations built channels to transport water, the Romans revolutionized hydraulic engineering through the utilization of pozzolana, a volcanic ash found near Mount Vesuvius. When combined with lime, this material created a highly durable underwater concrete that allowed Roman engineers to construct massive, multi-tiered aqueduct bridges across wide valleys and turbulent rivers. Unlike modern concrete, which degrades relatively quickly when exposed to moisture, pozzolana concrete actually grew stronger over time due to a chemical reaction between the seawater and the volcanic minerals. This unique crystalline structure prevented the propagation of microscopic cracks, ensuring that the aqueducts remained functional for centuries with minimal structural maintenance, thereby securing a consistent water supply for the empire’s rapidly growing urban centers.
According to the passage, how did Roman pozzolana concrete differ from the concrete used in modern times?
- It became increasingly durable over time when in contact with water, whereas modern concrete deteriorates under similar conditions.Answer
- BIt was less durable than modern concrete because the volcanic minerals in it reacted negatively with seawater.
- CIt degraded rapidly upon initial exposure to moisture but stabilized after centuries of use.
- DIt required constant structural maintenance to prevent microscopic cracks from propagating.