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I may be wrong here cd, but I'm sure I used standard building sand for all my concreting. I don't think it matters - the sand part of concrete is just a finer grade of the gravel you'll also use in the mix, and sharp sand is just grittier than building sand.
Perhaps you could phone a builders merchant to ask them, if you're worried about using it
You can use it, it will be a bit softer than a sharp sand mix, so don't add quite so much water when mixed, leave it a bit stiff, or your slabs will sink.
Is it concrete you're making or just mortar? If it's to lay paving it's only mortar you need. From memory, I think 1 part cement to about 3 or 4 is the usual for a mortar mix. Dave will know better than me though
As Fairygirl and Dave said, it'll be fine. What sort of patio are you laying (eg slabs/paviours or a plain sheet of concrete)? If the latter, you will need to add some gravel or similar to give it more structural strength, but if bedding slabs onto a hardcore bed, you can just mix a mortar.
Hope it goes well cd
Must be a big patio - that's a lot of sand!
Your mix is 3 to 1, if you put too much of either in it won't be workable and you'll get cracking and an unstable base. Just add a little less water to the mix, you don't want it sloppy.