Will concrete harden although some rotted wood is still in hole?
closed as unclear what you're asking by Tester101 Sep 4 '14 at 16:52
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
Highly recommend you dig out the rotted post, especially for a patio. Do it right the first time, going back later will be a nightmare.
If you want to take the lazy way out, cut the post and bury it. Add another one directly next to it.
Hydration is the chemical process by which concrete mixtures harden. Absent a retarding admixture, the hydration reaction occurs in any proper concrete mix. Wood, rotten or otherwise, is not typically a retarding admixture.
Embedding rotten wood in a foundation is not consistent with good practice, industry standards, and building codes. Furthermore, embedding wood in concrete is, in general, a sub-optimal practice.