How to make concrete slurry

Written by lisa east hunter
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How to make concrete slurry
Use concrete slurry to bond new concrete to old concrete. (cement finisher image by Greg Pickens from

Concrete slurry is used as a glue to bind old concrete to new concrete. It is especially helpful when patching cracks or holes in existing concrete, and for applying stucco over the top of concrete board. Slurry is also used to smooth the top of a concrete surface like worktops. Many people make the mistake of mixing new concrete to patch the holes in their driveways or paths. It may hold for a while, but by simply adding concrete slurry as glue, the new concrete will bond to the old and the patch can last as long as the original concrete. Making the slurry is simple.

Skill level:

Things you need

  • Cement
  • Water
  • Paintbrush

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  1. 1

    Fill a large bucket with dry Portland cement.

  2. 2

    Mist with water the area where you are planning to use the concrete slurry. Make sure the concrete that will be patched is wet when you apply the slurry.

  3. 3

    Add water to the cement slowly. Stir continuously as you add the water. Add enough water so that the mixture is the consistency of wet paint.

  4. 4

    Dip a paintbrush into the mixture and paint it into its intended spot. Move quickly, before the slurry has a chance to dry.

  5. 5

    Immediately apply the concrete slurry to patch your holes, smooth worktops or apply stucco.

Tips and warnings

  • A bonding agent can be added to the slurry mixture. Use an acrylic-based bonding agent. Add it to the mixture so that it is 10 per cent to 15 per cent of the total volume. This is not a necessary step but will help your slurry better adhere to the existing concrete.

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