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Lecture theatres, science laboratories and student unions are among UK University buildings shut because of a crumbling Concrete .

Thirteen universities have told Bbc News they have closed or partially closed areas containing reinforced autoclaved aerated Concrete (Raac).

Lectures have had to move to other areas of campus.

Some freshers events have also been affected as universities make areas safe.

Last week, The Department For Education (DfE) advised schools, colleges and nurseries in England to vacate areas known to contain Raac, unless suitable mitigating measures had been put in place.

Other public buildings across The UK, built or modified between The 1950s and The mid-1990s, are also affected.

, After The Concrete was found in theatres.

And St David 's Hall, in Cardiff, has closed for checks, with comedian Adrian Edmondson, singer Alfie Boe and 1980s Rock Band Europe due to perform in The Coming weeks.

to report they may have been built using Raac and The government said it was working quickly to establish The scale of The Problem .

Many buildings have been managing and monitoring The Situation for years, In Line with previous guidance, But Some are now taking extra precautions.

Of The 81 universities to have responded to a Bbc News request for information:

Also on Thursday, The DfE built using The Concrete - But education unions said it " does not appear to reflect The full extent of The Problem " and must be updated.

The DfE said The List included only schools where its surveyors had found The Concrete as of 30 August - and not those that had had their own surveys.

Six unions have now written to Education Secretary Gillian Keegan , including: " How many schools with suspected Raac have yet to be surveyed? "

In Essex, The County with The Most affected schools, about 25 are closed, partly closed or making alternative arrangements and.

Source of news: bbc.com