Posted by Rollie NE PA on April 22, 2014 at 16:15:55 from (108.50.2.246):
In Reply to: Re: driveway repair posted by showcrop on April 21, 2014 at 18:45:24:
Showcrop, 2A used to be referred to as modified. 2A is a Penndot standard and is federal highway approved as far as I know. I have to disagree with you on compaction of gravel, aggregate.
Gravel> AASHTO #57 2B This material has a 1-1/2 inch topsize and is a clean material. AASHTO #57 washed Used in ready-mixed concrete and hot mix asphalt Also used for driveways, walkways, and drainage Clean material that does not compact well.
Here is the Redneck test results. Place gravel of any size on a driveway, roll it well. Then take your pickup truck to the gravel driveway and mash the throttle. Gravel will fly everywhere and you will have a hole or a rut.
Now take 2A Modified and roll it and repeat the spin test. The result will be that the tires just spin on the surface and do not displace the material.
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