I have an idea for a walkway or driveway that would be surface with thick hexagonal pavers.
One of the challenges of this design is that the edge of the paving will be irregular, since each tile is hexagonal:
So, one thought I had is to use concrete. I would build a form around the edges of the paving and pour concrete to secure the sides and produce a straight edge to the road or walkway.
My concern is that the concrete might be incompatible with the stone in some way. For example, it might contract and expand at a different rate.
What are risks here? I want to avoid a situation where the edging is cracking and falling apart in 10 or 20 years.