So far, most of the sources I have found say to never pour concrete on frozen ground. They also specifically say to never pour concrete on snow. I usually don't listen to what people tell me, so I will continue to find a way to make this possible.
I have tried finding things to add to the concrete to keep it from freezing, but they either don't work very well, or just cause other problems. I added engine coolant to one of my mixes, and it didn't freeze, but it also ended up soaking up all of the moisture from the snow, thus ruining my mold and flooding my mix with unnecessary water. I tried adding salt to one of the mixes to help speed up the curing process, but while it speeds up the curing, it also makes a lot of heat, which melts the snow and ruins the mold.
I am considering possibly placing something between the snow and the concrete, like a tarp or plastic or something, to prevent it from soaking up the moisture. This way I could allow the concrete to cure for as long as it needs without being flooded by the water from the snow. Speeding up the curing process won't work the way I tried it, but there are some commercial curing compounds I am looking into that may help speed up curing without creating a ton of excess heat.
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