[independent.co.uk]
What caused the RAAC concrete closures? The one beam that has forced over
100 schools to shut | The Independent
....
A minister has revealed that just one collapsed beam at a school
sparked the emergency decision to halt the return to classrooms for
over 100 schools.
Schools minister Nick Gibb said a number of instances had occurred
"over the summer" where a type of concrete used in a number of schools
was found to be "unsafe".
This included a beam collapsing on school premises, despite there being
no external signs it was a "critical risk".
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rest:
https://www.independent.co.uk/news/uk/home-news/school-closures-raac-concrete-closed-b2403208.html
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