2023 United Kingdom reinforced autoclaved aerated concrete crisis

The 2023 United Kingdom reinforced autoclaved aerated concrete crisis relates to increased safety concerns over reinforced autoclaved aerated concrete (RAAC), commonly used historically in roofing and wall construction within the public sector, having gained popularity in the mid-1950s as a cheaper and more lightweight alternative to conventional reinforced concrete. Structural issues involving RAAC began surfacing publicly in the United Kingdom in the 1990s.

Source: Wikipedia — 2023 United Kingdom reinforced autoclaved aerated concrete crisis (CC BY-SA 4.0)