"hugh neary" wrote in message
...
I asked this question on the NG some time ago but the suggested
solution of rebuilding in the same fashion does not appeal.

Would it be feasible to use "casing" or a couple of wood sheets nailed
approx 750mm apart, then fill thes with a gravel/ cement mix along
with most of the original stone.

My thoughts are that the more stone that goes in the stronger the
final wall.

Or might there be problems with the ingredients expanding and
contracting at different rates?

No, it would look like ****.
You will have to GOYA and do a proper job.
It will be time consuming and/or expensive.
And you will need a proper concrete footing.

The strength of any cement/aggregate mix depends on how strong the aggregate
is and how much cement there is in the mix.
There's no point in putting lots of cement in a mix where the aggregate is
weak.
Most concrete fails due to voids in the mix, ie, not properly
tamped/vibrated down.