.IN THE COURSE OF A EUROPEAN structure boom that started in the 1960s, a novel kind of construction material began to become made use of. Strengthened autoclaved oxygenated concrete, referred to as RAAC, is actually pre-cast in a manufacturing plant, usually right into planks, prior to being actually required to a construction site where it may be rapidly set up into portion of a property. Although RAAC is actually still utilized in lots of parts of the planet, Britain is having certain issues along with it. In some buildings the material is crumbling in 2018 it resulted in a school roof to collapse. A number of colleges have been closed and also other properties, including medical centers, are influenced. This is inducing concern among the general public and a political migraine for the government. What is RAAC, and why does it end up being unsafe?