The ancient Romans were masters of building and engineering, perhaps most famously represented by the aqueducts.

The properties of this concrete have generally been attributed to its ingredients: pozzolana, a mix of volcanic ash – named ...

(credit: Parco archeologico di Pompei/Handout via REUTERS) Concrete appeared to have been made through "hot mixing", whereby quicklime was initially mixed with dry pozzolana, or pozzolanic ash ...