Vacuum the hole to remove dust and debris.
Level the bottom of the hole with the hammer and nail. Use the nail as a chisel and cut away any uneven cement at the bottom of the hole. Vacuum again to remove dust and debris.
Brush a thin layer of bonding agent on the bottom and sides of the hole.
Mix the cement patch according to manufacturer's directions. Use a patch mix with a course aggregate, such as crushed stone.
Trowel the patch into the hole. Push down with the trowel to work the patch into all corners of the hole. Let the patch mound up over the surface of the hole.
Scrape the piece of wood over the hole in a back-and-forth motion to level the patch with the existing cement. Remove the patch from the surrounding cement with a damp rag.
Allow the cement patch to cure for 48 hours. Twice during the curing process, repeat Step 6 to ensure the patch blends seamlessly with the surrounding cement. Keep the temperature of the surrounding cement above 50 degrees during the curing process.
Vacuum the area thoroughly to remove dust and debris.
Mix the cement patch according to the manufacturer's directions. Use a patch with a fine sand aggregate.
Apply the patch to the hole using the trowel. Press down on the patch to work it into all areas of the hole. Allow the patch to mound up over the surface of the hole.
Scrape the wood over the hole in a back-and-forth motion to level the patch with the existing cement. Remove the patch from the surrounding cement with a damp rag.
Allow the cement patch to cure for 48 hours. Twice during the curing process, repeat Step 4 to ensure the patch blends seamlessly with the surrounding cement. Keep the temperature of the surrounding cement above 50 degrees during the curing process.