You have to prep the edges correctly and use the right materials.
Chipped concrete floor.
First clean the hole in the concrete slab.
For concrete spalling the damage occurs on a microscopic level.
Step 1 cleaning the chip or hole in the concrete slab.
Shallower holes need a sand mix.
Makes the floor s surface crumble completely or separate in several thin layers.
Chip the concrete into small pieces and place into buckets to dispose.
Holes 1 inch or deeper require a concrete mix with coarse crushed stone aggregate which bonds well with existing concrete.
Check your phone book under concrete recycling or take the concrete chunks to a city dump.
A wire brush is ideal in.
You will want to get rid of these as well and wipe the area clean.
2 to 4 inches things like small houses patios and small storage sheds will have concrete approximately 2 to 4 inches thick.
Make sure to get rid of all dirt and grime.
Dislodge smaller crumbling bits of concrete in the crack with a wire brush.
Sometimes concrete chips remain in the hole.
Occurs usually because of cold climates which subjects the concrete to something called a freeze thaw cycle.
Next with a detergent and a scrub brush clean the concrete.
Pry up partially chipped or flaked sections of concrete with a putty knife.