Tag with key material=* to indicate concrete. Concrete is a hard material composed of a mixture of sand, water and aggregates.
Note surface=concrete.
Other materials at Template:Map Features:material.
Possible tagging mistakes
material=Concrete🔎 ‒ Capitalized
material=béton🔎 ‒ Generally a misspelling or a different language
material=Béton🔎 ‒ Generally a misspelling or a different language
material=beton🔎 ‒ Generally a misspelling or a different language
material=Beton🔎 ‒ Generally a misspelling or a different language
material=calcestruzzo🔎 ‒ Generally a misspelling or a different language
material=Calcestruzzo🔎 ‒ Generally a misspelling or a different language
material=concreta🔎 ‒ Generally a misspelling or a different language
material=Concreta🔎 ‒ Generally a misspelling or a different language
material=hormigón🔎 ‒ Generally a misspelling or a different language
material=Hormigón🔎 ‒ Generally a misspelling or a different language
material=hormigon🔎 ‒ Generally a misspelling or a different language
material=Hormigon🔎 ‒ Generally a misspelling or a different language