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  2. Cracks and safety concerns: What's going on at this ... - AOL

    www.aol.com/cracks-safety-concerns-whats-going...

    Cracked and crumbling concrete throughout the garage is being repaired out of fears falling concrete could harm someone, according to community development director Joe Dulin.

  3. Concrete closure list: What schools will have to close ...

    www.aol.com/concrete-closure-list-schools-close...

    What is RAAC concrete? RAAC is a lightweight form of concrete used in schools, colleges and other building construction from the 1950s until the mid-1990s, according to a government website.

  4. Headteachers angrily accuse Sunak of ‘dumping on them’ in ...

    www.aol.com/13-schools-crumbling-concrete-raac...

    Headteachers have accused Rishi Sunak’s government of “dumping on them” by blaming them for the crumbling concrete crisis – attacking the Tories for “gleefully” pulling the last Labour ...

  5. 2023 United Kingdom reinforced autoclaved aerated concrete ...

    en.wikipedia.org/wiki/2023_United_Kingdom...

    The 2023 United Kingdom reinforced autoclaved aerated concrete crisis relates to increased safety concerns over reinforced autoclaved aerated concrete, commonly used historically in roofing and wall construction within the public sector, having gained popularity in the mid-1950s as a cheaper and more lightweight alternative to conventional reinforced concrete.

  6. Concrete degradation - Wikipedia

    en.wikipedia.org/wiki/Concrete_degradation

    Example of flat piece of concrete having dislodged with corroded rebar underneath, Welland River bridge across Queen Elizabeth Way in Niagara Falls, Ontario. The expansion of the corrosion products (iron oxides) of carbon steel reinforcement structures may induce internal mechanical stress (tensile stress) that cause the formation of cracks and disrupt the concrete structure.

  7. Autoclaved aerated concrete - Wikipedia

    en.wikipedia.org/wiki/Autoclaved_aerated_concrete

    Autoclaved aerated concrete (AAC) is a lightweight, precast, cellular concrete building material. It is eco-friendly, and suitable for producing concrete-like blocks . [ 1 ] It is composed of quartz sand , calcined gypsum , lime , portland cement , water, and aluminium powder .