Roman concrete was like a super-strong cake. Instead of using sand and cement like we do today, the Romans used volcanic ash mixed with lime and water. This made their concrete extra tough, even when it got wet, and that helped it last for hundreds of years.
Examples
- Modern sidewalks break easily after a few years.
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See also
- How Does Ancient Roman Concrete Last So Long?
- Why Roman Concrete Lasts for 1000 Years?
- Why isn't Roman Concrete used today?
- How Did Ancient Rome Manage Its Huge Public Works?
- How Did the Roman Empire Affect Modern Politics?