reuse or use new concrette?
I would break the old concrete off and check the posts for rot. You would just have to dig a bigger post hole to try to use the existing concrete collars and it will be hard to plumb and line up your posts with that mass around the base.
I used the dry method of setting post most of the time. Set your post. Add dry mix. Plumb and line the posts. Pour in water to cover.
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