I've done lots of concrete work (it's not "cement," by the way) and I'd call the ready-mix company that provided your concrete. Explain what happened and ask for their advice. It's a free source of good advice. They've seen it all. They may advise you to grind and paint it. Seems to me that should give you a suitable finish. Paint will cover little defects.
Oh, my brother is in this business in Edmonton. If you want, PM me and I'd be happy to ask his advice for you. But I'd call the ready-mix company. They'll know what to do. If you got your concrete from a small outfit, then I'd call one of the biggies and say something like, "Hey, this happened to my concrete.........What do I do now?" Don't tell 'em you bought it elsewhere. Good luck.
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