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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