I want to know the answer to the following question:
What material was used in Brutalist structures?
All the background I'm provided with is that "As the first generation of modernists began to die after WWII, a second generation of architects including Paul Rudolph, Marcel Breuer, and Eero Saarinen tried to expand the aesthetics of modernism with Brutalism, buildings with expressive sculptural facades made of unfinished concrete.". Is that enough to answer the question?