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Tractor Talk Discussion Forum

Re: driveway repair

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Author  [Modern View]

04-21-2014 18:45:24

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Like Rollie says you have to cut, or in other words grade to the bottom of the potholes, using some sort of blade like a fairly heavy three point blade. Otherwise the pot holes will just come right back. Then like Janicholson says add 3/4 crusher run and crown it up good. Gravel will ALWAYS compact and needs to be compacted, but unless I needed to drive 25 MPH or so I would just compact it with regular traffic. I have hauled from a lot of different places but I have never heard of 2A, it must be a regional thing.

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Rollie NE PA

04-22-2014 16:15:55

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 Re: driveway repair in reply to showcrop, 04-21-2014 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.

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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04-22-2014 19:28:46

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 Re: driveway repair in reply to Rollie NE PA, 04-22-2014 16:15:55  
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Here in NH State spec road base gravel and crusher run are nearly the same thing and the terms are used interchangeably. However not all crusher run passes state spec because it will have too much of one sieve size aggregate and too much of another. So regular crusher run may need to be "doctored" a little to bring it to spec. I hauled many loads of state spec road base from a quarry whose invoice states at the bottom that the crusher run does not meet state spec. They just added back in some material of the right size to make it meet state spec. Now what you are calling gravel may be what we call washed stone here. Washed stone will not compact in years, whereas the road base crusher run gravel used on roads here will within a month of just regular car traffic compact to the hardness of concrete.

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Rollie NE PA

04-23-2014 16:24:19

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 Re: driveway repair in reply to showcrop, 04-22-2014 19:28:46  
Showcrop, We are on the same page, just different terminalogy for the different classes of products.

PennDot 2A has some of the overburden mixed with the rock as it goes thru the crusher. It makes a very good road base material. Compaction is tested with a Nuclear Densometer.

Does your state use Superpave asphalt mix? I have mixed feelings about it.

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04-23-2014 17:43:55

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 Re: driveway repair in reply to Rollie NE PA, 04-23-2014 16:24:19  
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I am not familiar with that. I hauled about twelve loads of 3/4 base on Monday and it looked the same as it ever has. What is different about it?

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