How to make new concrete stick to old concrete

Written by joshua bailey
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How to make new concrete stick to old concrete
Smooth new concrete over the old, cracked surface. (wuttichok/iStock/Getty Images)

Fixing cracks and holes in old concrete can become a very big chore. You can't just fill in the cracks and expect them never to come back. Instead, over-pour your existing concrete with new concrete to repair and strengthen the entire structure. Use a bonding adhesive to ensure the new concrete sticks to the old surface.

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Things you need

  • Shovel
  • Bond adhesive
  • Concrete mix
  • Water
  • Trowel

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Instructions

  1. 1

    Remove all debris from the old concrete. This can be done with any type of tool that scrapes up the flaky concrete. A flat shovel works well.

  2. 2

    After you built your forms and placed them alongside the concrete, apply a thin coat of the bonding adhesive. Use a paint roller to apply if the adhesive didn't come with its own brush or applicator.

  3. 3

    Mix, pour and smooth your concrete out on to your old concrete slab. Use a wet trowel to perfectly smooth the top once all the concrete is on.

  4. 4

    Allow the concrete to dry for between 17 to 24 hours to make sure the best seal is achieved. Remove the forms after the proper period of drying has passed.

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