Kemptville school built with same material as suddenly shuttered Ontario Science Centre
Kemptville school built with same material as suddenly shuttered Ontario Science Centre
This is nothing to worry about. The only schools likely to choose as a result of this problem are ones where Doug Ford's wealthy family, friends, and donors own adjacent properties (like they do at the Ontario Science Center.)
Billions and billions of dollars of graft but buck a beer and lower gas taxes.
It's just a material, it's doesn't matter without the context of the engineering and construction.
My house is made of the same matrial they use to make fires!!
Reinforced autoclaved aerated concrete (RAAC) is a lightweight material that was used mostly in flat roofing, but also in floors and walls, between the 1950s and 1990s.
It is a cheaper alternative to standard concrete, is quicker to produce and easier to install.
It is aerated, or "bubbly", like an Aero chocolate bar.
But it is less durable and has a lifespan of around 30 years.
Its structural behaviour differs significantly from traditional reinforced concrete.
Moreover, it is susceptible to structural failure when exposed to moisture. The bubbles can allow water to enter the material.
If that happens, any rebar reinforcing RAAC can also decay, rust and weaken.
Because of this, RAAC is often coated with another material, such as bitumen on roofing panels. But this material can also degrade. Source
This is an international issue btw.