I just used Sakrete Concrete Mix - 5000 Plus to pour three footings for a small porch (4'X8') that will extend off the front of a shed (8'X10') that I'm building. I dug the holes to the frost line, put crushed stone in the bottom 2"-3", then poured Sakrete loosely on top of the stone for another 2"-3", then poured the footings into 8" Sonotubes on top of that. I finished pouring the footings at various times in the afternoon on Friday, the first one at about noon, the last one at about 3 PM. I held off on backfilling the holes because I figured the loose concrete in the bottom needed time to set. At 7 AM on Saturday it began to rain and by the early afternoon I noticed the holes had 1'-2' of water in them around the Sonotubes. So the Sakrete had some 16-19 hours to cure before the rain started. (We had covered the holes with a tarp, but the site is on a slight slope, so runoff that ran under the tarp was what caused the water in the holes.) My question: Should I be concerned about the effect of the standing water on the concrete?