Concrete or dry mix for base for raised pond

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6 Sep 2011
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Avon
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Hi There,
Would really appreciate some advice from someone with more experience than me!

I have an area of the garden which is hardstanding (concrete) but which has begun to fall away (we leave on a hill). It loses about an inch and a half over the four feet I need to be level.

I would like to put a raised/above ground pond on this area using a preformed self supporting plastic tub 6ftx4ft but obviously need a level base for it to ensure I don't see any of the side above water level.

Once on the base, I will build a timber surround and backfill between the timber surround and the pond, so the base I build beneath the pond will not be exposed to the elements.

I was thinking of putting in some timber form work, then a fairly lean dry mix of cement to sharp sand (1:10) - but will that be strong enough, and would it withstand being mined away by ants and the like - should I go for either a stronger or wetter mix?

Advice gratefully received!
Thanks
 
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I would go stronger more like 6:1, compact it and screed it level.
 

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