Which “castine” is best for driveway?

JaneJones · 16 August 2020 19:50

Popular subject! There was a post about this not long ago…

Self binding gravel, French equivalent? Property & Home

In this area - Jura - the road repair squads use a plate compacter with a particular stone / sand mix to repair the verges. Its quick effective and lasting. I suggest approaching your nearest stone quarry or specialist stone supplier, describing what you want the mix to do, and asking for a quote for supply and delivery. The 1 tonne bags that you can get from the local builders merchants are less likely to be the right mix. When I was a student some 50 years ago, one of the warnings that we were given was that ‘sharp’ sand expands from its dry volume when damp, and shrinks back to close to its dry volume when fully saturated. (e.g. https://preservationscience.wordpress.com/2013/09/08/exploring-void-and-pore-space-in-aggregates-2/ ) So local knowledge balancing the blend of small particles against the larger ones for the locally available stone is likely to avoid future heave, even if you do compact it.