volcanic ash

Concept

Called pozzolana, this was added by the Romans to crushed limestone before heating to create a stronger, more durable cement that could harden underwater.

Mentioned in 1 video

Videos Mentioning volcanic ash

Can you float in concrete?

Veritasium

Called pozzolana, this was added by the Romans to crushed limestone before heating to create a stronger, more durable cement that could harden underwater.