Milled Asphalt??

[vtsnowedin]

Around here the construction companys that are doing the milling will not sell them, much less give them away. They figure they are worth at least ten dollars a ton and that price goes up with the price of crude oil. They think 100,000 yards of them in a stockpile is like gold in a vault.
They make an excellent top course on a road or parking lot if installed properly as has been said in thin lifts and well compacted. I like to mix them with inch and a half concrete stone to turn them into a super crushed gravel that does not have the problems of needing to be placed in thin lifts. About one part stone to three parts millings works well. Grade it to where you want it before you let traffic have it as it digs up very hard if you need to move it.

 

[EdC]

About 6 years ago I dug up a large part of my 800 ft driveway since it was so muddy. I put in geotextile fabric then 3 inch minus crushed concrete and topped it of with 3/4 minus regrind. It has held up remarkably well; the ground up asphalt became almost like pavement. I am about do for a topcoat of another 2 or 3 inches of asphalt though; some of the crushed concrete is starting to show through. I didn't pay all that much for the material but trucking it 26 miles one way wasn't cheap. I would recommend it, especially over a good base.

 

[Red Horse]

Amen. My two cents, if you are doing it, get a vib roller, and also try to do it with warm temps. Also in some states it is not exactly legal-don't ask why-makes no sense to me-great stuff. In addition unlike graded base or bank run gravel, it is less likely to erode during heavy rain.

Key IMO is put it down when it is warm-direct sun- and also if possible get your self a vib roller.

 

[crazyal]

I've heard rumors that the reason why it could be illegal is all of the oils and other substances that have leaked onto the pavement over the years. I was going to put some down on our ROW since it's about the same price as crusher run but one of the neighbors is worried about contaminating his well. Since it's not worth getting anyone upset I'll pass on it. Besides it just means more seat time grading the stone.

 

[paulharvey]

I don't think realistically there is going to be any serious contamination problems, this material is used in nearly all new asphalt (70% new/30% reclaimed), as base when FDOT widened shoulders (mill road surface, shoot millings directly into plowed out widening), and drive ways.

Added advantage is that when used in a commercial/ church parking lot, it is Not considered "impervious surface" meaning you don't have to build a larger retention pond.

Disadvantages
-cost, millings ($10/ton), limerock($6/ton), sand-clay ($3/ton), real super-pave hot mix asphalt ($65/ton)
- although we call it all millings, the quality, and texture vary depending on type/age/depth if milling operation. Some are dust to ~1"; some have pieces of asphalt as large as 6" long by 1" thick. Some of the rougher millings are not going to be easy to finish grade well.
-in Florida millings/RAP are not FDOT approved for "roadway base" meaning under actual travel lanes in a road, although they have been doing some experiment using it mixxed with 20% clay to improve bonding

 

[vtsnowedin]

I don't think realistically there is going to be any serious contamination problems, this material is used in nearly all new asphalt (70% new/30% reclaimed), as base when FDOT widened shoulders (mill road surface, shoot millings directly into plowed out widening), and drive ways.

Added advantage is that when used in a commercial/ church parking lot, it is Not considered "impervious surface" meaning you don't have to build a larger retention pond.

Disadvantages
-cost, millings ($10/ton), limerock($6/ton), sand-clay ($3/ton), real super-pave hot mix asphalt ($65/ton)
- although we call it all millings, the quality, and texture vary depending on type/age/depth if milling operation. Some are dust to ~1"; some have pieces of asphalt as large as 6" long by 1" thick. Some of the rougher millings are not going to be easy to finish grade well.
-in Florida millings/RAP are not FDOT approved for "roadway base" meaning under actual travel lanes in a road, although they have been doing some experiment using it mixxed with 20% clay to improve bonding

I agree with everything in this post except that last line on adding clay. Wet clay equals MUD. Northern DOTs reject any material with more then a small percentage of finner then a 200 sieve per federal standards.
http://www.nh.gov/dot/org/projectde...pecifications/documents/2010_Division_300.pdf

 

[paulharvey]

We also undercut "fat" clay, very plastic clay, gumbo, but many many roads where built with a sand-clay base (ball field clay) and although it isn't as good, and we don't use it for new work where I am, it is still listed under substandard optional bases for limited use by FDOT (limited to 10 year design life/1 milling adjusted axle trips)

FDOT did some experiments showing a 80% rap/20% sand clay mix was at least 100% as good as limerock in all of there measurables. But this is not a standard at this time, it was test strips.

FDOT Index #514, page 1 is standard bases, page 2 sub standard, but will far exceed the needs of driveways (how long does it take for you to make 1 million trips?).

And yes, straight up sand-clay does get slick when wet, but limerock can as well, the fines can turn to a lime slurry. When I say limerock I do Not mean limeStone. Its a fairly soft material, with rocks up to the size of a fist down to powder, but the rocks can be cut by a graders blade.

I can't seem to find that site about that test strip with the clay mix.

 

[Soundguy]

good stuff. use it!

we have even used it as stabilizer. I like it better than crushed concrete.

 

[Soundguy]

after you get it installed. tack or prime it then sand it.

 

[tractchores]

I have used it for a parkinglot. It was ok, not great. The issue is it gets torn up by the plow and is a pain to relevel. We packed ours with a steamroller. I also didn't like the way it looked a d wouldn't use it again...