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I've mixed concrete before, but only as a labourer or kid when I had someone who knew what they were doing to say "more of this/that" or just "that looks about right". I think my main concern would just be getting the mix wrong and having to pay more to get it lifted and relaid. I may go with the clearing and shuttering myself so then I can give more definite specs to a builder or local landscaper. I'll ask my builder if he does that kind of thing when he's next here.
stevo_com-
If hairy arsed builders can do it, so can you. The consistency you are looking for is stodgy porridge, just add water carefully as you can't take it out again. My publishing management background isn't a huge help when mixing concrete, but at least I can have coherent conversations with clients whilst doing so.
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I've mixed concrete before, but only as a labourer or kid when I had someone who knew what they were doing to say "more of this/that" or just "that looks about right".
I mixed tons of concrete for my dad as a teenager when we built a garage and concreted the driveway to it. His mate came to help once and mixed the concrete that day, the stuff he mixed degraded far quicker than the stuff I mixed. As @Colin_the_Bald says, getting the consistency right is key.
ColinTheBald
andyp
I had mine pumped from the street to the back of my garden, the line was about 50m. They moaned about the length when they got here, I think above 50m and they start to charge extra.
Mine was 6m x 4m, 150mm thick. Your size I'd be tempted to DIY it if you have the time.
For the sake of £25 or so for a sheet of steel mesh, I'd be tempted to chuck one in, it really does strengthen the concrete and helps prevent cracking