Stone track advice - Steep mot1 track

[PhilChap]

I am currently pricing up a job where the architect has specified 200mm techcell geocell (expanding rootzone type) on a sloping track filled with MOT1 with an initially 25mm but now 50mm cover over this of the same material.
My thoughts are the MOT1 may soon wear/wash out due to a lack of fines and the cover would perhaps be better with 20mm to dust or at the very least an initial cover of dust. Has anyone any thoughts or experience on this?
I did price this same track up some years ago with concrete tracks but as it is a heritage site this seems to be the latest plan.

[lemoncurd1702]

If it's unbound it will wash away.

But if that's how the architect wants it:
"You're not here to wonder why, you're just here to do or die".

I've seen that type of flexible geocell used on moderate slopes and fail, don't think it's meant to be trafficked.

[PhilChap]

The surveyor accepts there will be maintenance requirements but I think cost and the heritage issue means that this is the preferred option. It does seem to be a lot of work to create a surface that may soon deteriorate. The track passes through an ancient monument and is around 270m long. Where the track flattens out and the specification here is to shape up, terram, 225mm MOT 1 then 25 mm of 6mm to dust.
The suppliers of the geocell seem to be confident it will work but my feelings are the cover layer will soon wear off exposing the plastic.

[GB_Groundworks]

We've got an mot track down to our muck heap from stables it's steep no georextiles just mot well consolidated and now the grass has grown through it doesn't go anywhere even when running up it with 9 ton of tractor etc

If you do it to spec you've done your job!



Edited By GB_Groundworks on 1434110684