What happened to cement/mortar that didn't cure?
I attempted a mosaic in large cracks in cement blocks in my patio. I saw a blog that suggested putting 1-2 inches of dry concrete mix then 1-2 inches dry mortar mix then placing mosaic tiles on top before wetting. It was fairly cold when I attempted this (~45 degrees and damp). After gently watering off and on for ~1 hr., I covered with a curing blanket. Days later it seemed hard but now it is crumbly and dry. Is there anything I can do about this now, or do I just need to dig it all out and do again in the spring?