Re: New Driveway Question

Posted by Billy NY on October 31, 2016 at 10:18:38 from (104.228.35.235):

In Reply to: New Driveway Question posted by John B. on October 31, 2016 at 04:06:18:

Crusher Run (Item #4) is what its called around here, its a composite mix of crushed stone and fines with a certain size passing through a sieve, 3/4" if I recall. This material is NYS DOT approved sub-base for roads. Depending on your ground conditions, it may be all you need, grade and compact in 12" lifts over existing if its suitable. For larger/deeper fills, there are lots of types of run of bank gravel you can use before topping off with crusher run for either a wear surface or sub-base for some kind of pavement ie; bituminous asphaltic concrete, (asphalt paving) or say concrete itself.

Key things are drainage, determining if existing undisturbed is suitable to build up on or you need stabilization fabric to overcome existing conditions etc.

Clean 3" stone with no other sieve size passing through, just the 3" stone, is not going to compact because you need an array of aggregate/fines to achieve that with optimum moisture levels. Same is true with fine sand, it can be settled with water but you you would never build a pad for a slab or use it for a sub-base for a driveway, again it needs a composite amount of various sieve size aggregate with optimum moisture to compact and be able to support the intended loading properly.

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