Posted by Billy NY on June 15, 2012 at 09:34:47 from (67.248.100.3):
In Reply to: OT - Gravel posted by grandpappy on June 15, 2012 at 08:59:16:
To get compaction you definitely need an array of aggregate sizes in a composite mix or your R.O.B. gravel, hopefully you have some fines in it, or like was mentioned you may have to add some, like what we call stone dust and up in the sieve size ( (screen size).
I have used from a local and unique quarry, the tailings or spoil from what they mine, a fine powdery shale dust, that has larger aggregate in it. The material is called Norlite and its an ASTM specified aggregate for lightweight concrete mix designs.
I have also scarified, re-graded and added portland cement to existing or fresh gravel, you do need to use an adequate amount, but like most of these fixes, always need to maintain them at some point, but the portland or even a similar dusty material to bind, or bond the other aggregates together is better than none.
Road base material is commonly called Item #4 for NYS DOT approved materials or crusher run that has a certain sieve size aggregate, like maybe an inch, then down to dust, add portland to that and get it mixed in when placing this, it will harden, but you have to add enough portland to it. Large areas may not or may be feasible, once set it does need some dry time, no downpours or you may lose it, I'd almost say its hit or miss but can be done. I use portland and stone dust mixtures in horse stalls to repair the bowl shape areas that appear after so long, it can bind right up like concrete but not have the compressive strength, in case you want to take it out.
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