Acidified surfaces

An acidified surface is achieved if the top layer of fine mortar of the concrete surface is removed by means of an acid. Only the cement skin is removed, the abrasion giving the surface its artificial appearance.

The concrete determines the colour

It is possible to obtain different “acidification depths”. The colour of the surface is mainly determined by the finest aggregates in the concrete since the coarser aggregates are only exposed to a very limited extent.

Big picture:
Base cladding made of exposed concrete elements using so-called formliner technology.
Project: RAG Headquarters, Essen, DE.
Photo: BetonBild. Architect: Bahl Architekten BDA, Hagen, DE