I don't think the question for you is what type of cement. You can use any fast-setting cement as long as:
1) You have the 'proper depth, 2) you use the 'proper' length/thickness pole, and 3) the height does/doesn't require 'guide wires'.
Jay J -MOderator
PS: Some Municipalities don't allow standing poles w/o a permit so be forwarned. Also, you may need fencing too to keep kids and such from getting hurt. In short, it's may not be that simple a project ...