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Monta la polemica nel Regno Unito dopo che oltre 100 scuole, college e asili realizzati in Inghilterra con calcestruzzo leggero - argamente in uso per la costruzione di edifici pubblici fra gli anni '50 e buona parte dei '90 - sono state chiuse temporaneamente d'autorità su ordine del Governo e raccomandazione di un ente nazionale di controllo, il National Audit Office (Nao). L'annuncio è arrivato giovedì da fonti ufficiali, ripreso dai media d'oltre Manica con grande evidenza e titoli allarmati.
La misura precauzionale fa riferimento al rischio elevato, se non imminente, di potenziali crolli in grado di provocare morti o feriti.
Il materiale incriminato, utilizzato all'epoca e soggetto a un deperimento relativamente rapido, è il cosiddetto Raac, ossia il Reinforced Autoclaved Aeriated Concrete (calcestruzzo aerato autoclavato): poroso e simile nell'aspetto al polistirolo espanso.
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