I am building a tree house. One side of it will be supported by the tree. The other with two 6x6 8' pressure treated posts.
I wanted to support those posts with concrete footings. So I dug 24" down (minimum required here), and used tube forms.
Inside the tube forms are rebars - 4 flat in a # shape, then 4 coming up from the bottom. All rebars are surrounded by concrete so they don't get exposure to air/soil.
For one post, I surrounded and tube with more concrete. With the other I did too, but less concrete.
When I prepared the concrete, I used exactly the mid-range of water that the bag said (range was 3.5-4.5 QT, I used 4).
It was a bit dry but seemed ok. I poured it in and kept compacting it as I went.
Since then (36 hours ago) I've been wetting the footings regularly.
Now, I begun stripping away the forms, and I see what's in the attached.