Can I use this to level ground under workshop slab

[Owain1602]

Hello all,

 

I’m currently in the process of preparing ground for an 8x8m steel frame workshop. The area currently has a 1m elevation change from one end to the other. I’m digging in to the bank on the high side, planning on getting a level pad at the height of the current lowest point. 
 

Obviously I needed to remove material from the current lowest elevation to remove the topsoil etc, before filling this back in with suitable aggregate.

 

As I’m digging in to the bank to level the ground, I noticed the material coming out looks surprisingly similar to the material I’d be buying in to raise the ground at the lower side. 
My question is, do you think this material is suitable to bring the levels up (see image below)? I would be using MOT or similar as the final layer under the concrete slab.

 

It’s all dug out and 10m away from where I’d need it. 
I would lay it in 150mm layers and bring in a heavy plate compactor or even a roller if needed. Workshop will be steel frame, 1m3 concrete stanchion under each steel, with 200mm C35 slab encasing the steels, A252 mesh. 

 

As further background for those interested. The site is at the highest elevation in the area, and is predominantly sand and sandstone from about 150mm down. 
 

We’ve had a Geotechnical ground survey for our house foundations (approx 40m away), and the ground has >150kPa bearing pressure from 500mm down according to the report. 
 

Thanks for any advice!

[Mike]

It looks promising - similar to stuff I've used in the past - but standards change and I'd want my SE to take a look at it. Otherwise try selling it (or part-exchanging it) to a local gravel company who can screen & resell it.