Failure of Two-Pour Joint

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• If the joint between the two pours is not properly cleaned and prepared, there will be a poor connection between the concrete layers
  - The figure shows a failed two-pour joint
  
  - The problem is often discovered after an earthquake causes horizontal sliding between the pours.
  - Remedies include installing new vertical rebar dowels to tie the slab to the footing
  - These remedies must be designed by an architect or engineer