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That's very interesting, Dan.
I wonder what's different about concrete pavers (over just plain concrete)? Concrete driveways, walkways and patios have been poured over crushed limestone here for decades, and I've yet to see any of them show the same degradation you mention.
I've never seen it with any concrete pavers, either, but I may not have had an opportunity to pull really, really old paver projects like you may have.
Limestone isn't acidic, either. So I have to wonder if it was the pavers and not the base material beneath it. I've seen the tops of concrete pavers degrade into a crumbling mess while the bottoms, sitting on limestone screenings, were fresh like new daisies.
As for all your relay jobs being over screenings - I've seen a lot of relay jobs that were over sand - a bed of a material with very small particle size just cannot resist forces acting on it like something of larger particle sizes can, meaning there are more often traffic pattern ruts where a bedding sand course was used.
My $.02, anyway.
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