Béton brut

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Boston City Hall, an example of brutalism using béton brut
Detail of the Royal National Theatre showing the grain of the formwork

Béton brut (French pronunciation: ​[betɔ̃ bʁy], raw concrete) is architectural concrete left unfinished or roughly-finished after pouring and left exposed visually. The imprint of the wood or plywood formwork used for pouring is usually present on the final surface.

The use of béton brut was pioneered by Auguste Perret and other modern architects. It was used in such buildings as Unité d'Habitation in the early part of the twentieth century. It flourished as a part of the brutalist architecture of the 1960s and 70s. This largely gave way to structural expressionism as steel structures became more advanced and practical. Wood-imprinted concrete is still very popular in landscaping especially in some of the western European countries.

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