There are a few pictures of pools using insulated concrete forms here:
http://www.quadlock.com/insulated_concrete_forms/residential.htm
We've recently built a few pools in the UK using the above...
For sidewalks and other concrete surfaces, forms may be removed 1-1/2 to two days after pouring and finishing. Concrete "sets" pretty solidly after one day, but give it a little time to get harder,...