Cement-stabilised soil instead of type 1?

[senfre_]

Is cement-stabilised soil an adequate sub-base for a patio? I'm thinking of digging the soil (quite heavy clay) to a depth of 100mm, thoroughly mixing with 20mm cement, compacting & watering. This would then have the bedding layer directly on top and then the paving slabs.

 

[Deluks]

Some would say yes, but clay is not soil, at the end of the day it's well known for heave/shrinkage and poor drainage.
Your call, but it would be a sub-optimal sub-base.