An expert explains how to address the issue of ageing reinforced autoclaved aerated concrete (RAAC) in buildings.

RAAC, which can be found in many schools in England, is prone to sudden failure as it ages.

More than 100 schools, nurseries and colleges in England have been told by the government to close buildings that may be prone to collapse.

Chris Goodier, Professor of Construction Engineering and Materials at Loughborough University, said that while surveys may show that most RAAC in buildings is ok, some will have to remedied.

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