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I'm building a 16' x 10' shed on concrete posts. I'm going to use quikrete poured into sono tubes for the posts each of which will extend at least 42 inches below grade and at most 4-5" above grade. I'm planning to pour them on friday but the forecast for friday and the following days calls for high temperature's of ~35 F with over night lows dropping into the lower 20's. Am i making a mistake pouring under these conditions and if so, is there an additive i can mix with the quikrete to alleviate any potential problems due to the cold???