The tests research of blasting vibration simulating earthquake were carried out by a reinforced concrete pipe embedded landscape orientation and hangfire.
Blast walls of reinforced concrete or oil drums filled with coral protected the entrances to the caves, which often faced each other from the sheer walls of twisting gorges and were thus mutually supporting.
But the problem with reinforced concrete, especially if the rebar isn't covered with enough concrete and is exposed to water and salt, is that the steel inside can rust.
Many associate the beginning of Brutalism with the Swiss-French architect Le Corbusier who is known for introducing reinforced concrete as a key construction material in architecture.
The new castings are as was hoped both stronger and lighter than steel reinforced concrete tests showed that the prototypes load carrying capacity was 20% better.