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very good question....wasn't going to do any...the link you put says suggests that they are only needed for non-reinforced slab. I will be using reinforcing steel in mine...might be wrong though?
The usual recommendation is for some form of movement joint to be created in a non-reinforced slab
Aldersbrook-
It's the '7m' dimension.
A joint, dividing this in two, may prove to be cheaper, and easier to lay, than getting enough reinforcement in your slab to account for the expected expansion due to normal temperature changes.How good is your access to get the concrete to the slab? Or are you going all Thunderbirds with a truck mounted concrete pump?
mespilus
How many joints do you envisage?
http://www.pavingexpert.com/concjnt1.htm