The Ministry of Transport and Infrastructure said that the remains of an ancient wall which once formed part of the fortifications in Valletta have been discovered during the excavations.

There is a rich body of scientific research investigating the secrets behind the remarkable durability of ancient Roman concrete ... "was a mortar roof, lime-washed and very strong, as it is ...

He recommended the walls ... lime and porous fragments of glass and crystals from volcanic eruptions (known as volcanic tephra). Admir Masic, an environmental engineer at MIT, has studied ancient ...

The research, published this week in the journal American Mineralogist, details how ancient Roman sea walls built roughly ... but the Roman recipe of volcanic ash, lime, seawater and a mineral ...