The building inspector here requires pea gravel, which I assume is for drainage. You need a concrete plug about 12 inches in diameter and 8 inches thick at the bottom of the hole. After the post is set, the first foot of fill is pea gravel. They don't specify what you use to fill the rest of the hole.
What I did was to pour half a bag of dry redi-mix concrete over the pea gravel. That really locks in the post so it doesn't move around while you finish filling the hole. I suppose it could contribute to upheaval, but I've had no problems with that in the 12 years since I put up the building. I think the single most important thing to prevent upheaval is to make sure the site is properly graded and you have good drainage around the building. If the ground is dry, it's not going to heave.
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