Warm welcome, Folsom! Your little plants will be set back a bit, but I'm sure most will recover. I'd wash off as much of the concrete dust as you can, patch them up as others have suggested, and hope for the best. Brings back a memory from some 35 years ago when we were building our house. When the bulldozer arrived for some dirt work, the operator told me in no uncertain terms, "I don't want to hear any whining about your [expletive] pansies!" Luckily I had nothing whatsoever planted at that point in time, and as it turned out that operator became a close family friend. Still a bit rough around the edges...but a sweetheart.
