altbetont

Altbeton is a term used in German-speaking architecture and conservation to describe concrete that has aged or is finished to resemble aged concrete. It can refer to historic concrete that has developed a patina through weathering over decades, or to contemporary surfaces where the appearance of aging is intentionally engineered. In practice, altbeton denotes surfaces with variation in color and texture, such as subtle discoloration, minor cracking, and the exposure of coarse aggregates, sometimes accompanied by signs of surface wear or oxide coloration.

Historically, many early to mid-20th-century structures exhibit altbeton as part of their authentic material language. In preservation and restoration, the goal is often to document the original surface condition, assess deterioration, and choose interventions that respect authenticity. Conservation approaches tend to favor non-invasive cleaning and consolidation methods that preserve patina rather than removing or masking it with new finishes.

Technically, altbeton is distinguished from uniformly finished modern concrete by its irregular surface and evolved patina, which may result from natural aging, environmental exposure, or specific construction practices. Architects and restorers may also seek to reproduce altbeton effects in new work to achieve a historical or Brutalist-inspired aesthetic, using finishes or treatments that mimic the texture and coloration of aged concrete without altering the structural material.

Although not a formal engineering or material classification, altbeton is widely used in German-language discourse to describe both genuine aged concrete and restoration or design strategies aimed at achieving an authentic, weathered concrete look.