reinforced concrete

US /ˌriːɪnˌfɔːrst ˈkɑːŋkriːt/
UK /ˌriːɪnˌfɔːrst ˈkɑːŋkriːt/
"reinforced concrete" picture
1.

concrete in which steel bars or mesh have been embedded to strengthen it

:
The bridge was constructed using reinforced concrete.
Many modern buildings rely on reinforced concrete for structural integrity.