Up until this year the city repaired sidewalks that had been pushed up by tree roots by breaking up sections and pouring new cement. This year they started patching them up by laying down asphalt, and then pouring what looks like cement on top while it's still hot, smoothing it out and then sweeping off the excess. It blends in fine and seems to be OK, but I'm wondering how long the cement overlayer will last.

It's been a good 3 weeks now, and new cement dust still comes up each time I sweep. I have hesitated hosing it off thinking I may end up with asphalt patches.

Does this sound like normal or did the city not do it right?