Laboratory testing for the presence of Reinforced Autoclaved Aerated Concrete (RAAC)

What is RAAC and what is the problem?

RAAC (Reinforced Autoclaved Aerated Concrete) is a form of concrete often used in the construction of public buildings from the 1950s to the 1980s. Typically found in roofs, it was also used within walls and floors and is characterised as lightweight and bubbly in composition.

Material and construction deficiencies identified with RAAC have raised concerns regarding performance in structural applications when compared to traditional concrete. With a working lifespan of approximately 30 years, there is a growing need to identify and remediate properties which have RAAC panels installed.

To support this, the Government has recently issued new guidance on how RAAC can be identified and remedied.

How can Kiwa CMT help?

Kiwa CMT can support with RAAC investigations in the following ways:

• Visual confirmation – this is helpful for initial assessments in properties where little or no documentation is available
• Destructive site sampling – this involves removing small pieces of the panel for further investigation
• Non-intrusive site sampling – this causes minimal damage and is necessary where destructive sampling poses high risks
• Analytical laboratory testing – enables conclusive identification of whether a material is RAAC

With our team of experienced technicians, Kiwa CMT support structural engineers, building surveyors and facilities managers with investigating and identifying whether RAAC is present in a building.