The above schedule should be considered as a good starting point for a slipform concrete mix. Most contemporary batch plants are computer controlled and have a slipform mix already programmed. That does not necessarily mean that it is right for you. Whenever possible, a meeting with the batch plant operator should prove to be extremely advantageous in nailing down your mix prior to the start of the job. Nobody will know their mix as well as the batch plant. But at the end of the day, it is up to the slipform curbing operator to decide whether or not the delivered batch passes mustard or needs to be returned.