Joined: July 2004
||Posted: 25 April 2017,17:32
The usual method is to use a retainer of some description (maybe a Flag on Edge) and then build-up layers of compacted sub-base material until you have the desired lift.
However, for 6 square metres, that may well be a bit much so maybe it would be a matter of building-up level by using a relatively weak concrete, something like a C7.5/GEN 0 (see this page for mix ratios). However, you need to think how that elevated end will look. It could be that using a more decorative flag-on-edge even if the infill is the C7.5 concrete, would be a best option.
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