Perfect concrete ramp repair - GIF

[desbromilow]

ditto on liking the rotohammer for a vibe... what are the things he's putting into the concrete with the drill? = I presume they key the new concrete to the old, but what are they?

[BuffaloJohn]

what are the things he's putting into the concrete with the drill? = I presume they key the new concrete to the old, but what are they?

They look like concrete screws - a brand here are called TAPCON... they are dark blue in color...