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Concrete can fail for many reasons:

  1. wrong mix for job required
  2. not proper depth
  3. poured when frosty
  4. poured when too hot
  5. not left to cure long enough
  6. if upper level no secondary propping
  7. if ground slab hardcore not compacted properly or thick enough
  8. runways should not be used for at least 3weeks.

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15y ago

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