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Originally Posted by 0000000000000000000001000
Concrete, not cement.
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The yanks call concrete 'cement'. Does beg the question though as to what they call cement
OK, you want to do a patio that big, the depth (of concrete/cement) has to be at least 6inches and it MUST be reinforced if you don't want fick f/o cracks to appear. You'll need welded trellis reinfocement: the main rods should be 10mm diameter (8mm at the very veyr minimum) with connections of 6mm. The concrete/cement should be poured onto a 2-3inch base of 10mm gravel.
A mix of 3:2:1.5 (gravel:sand:cement) will suffice.
Happy mixing