Milled Asphalt Application

[chicopee]

Is it possible to asphalt a lot from milled asphalt
(lot is currently dirt and gravel) to support intermittent propane transport deliveries(GVW 80,000 lbs)?. Lot should be somewhat permeable to rain.
If the above is feasible, the milled asphalt would be applied in relatively thin layers between each compaction,therefore,how thick should the total base be?

 

[cvg]

you need a geotech investigation to design pavement. The geotechnical engineer can answer these questions for you

 

[coloeng]

In this part of the country, we use a lot of milled asphalt for country roads and parking lots. If your subgrade is adequate for a parking lot you should be fine. We usually put it down in about 3-inch lifts, spray it with magnesium chloride and then roll it. It works much better than road base, tends to bind together when it gets hot, and tends to create less dust than a gravel or road base surface.

If you have a subgrade that tends to get mud holes and ruts when it gets wet, you will need to do something to stabilize the subgrade. The asphalt millings aren't as permeable as road base or gravel, but they are certainly more permeable than an asphalt pavement.

 

[chicopee]

coloeng, thks for the info. By the way, what how is this material called on prints--process asphalt?milled asphalt?

cvg, your suggestion is fine but right now we are still in an exploratory phase on what we are going to do with this privately owned lot.

 

[coloeng]

In this part of the country we call it milled asphalt and everyone seems to know what we are talking about. If you plan on calling it out on drawings you need to make sure that you describe what it is in the specifications or on notes on the drawings.

 

[civilperson]

Milled asphalt can be used to make Hot Mix Asphalt by adding heat and 2% oil. Some savings if subgrade is suitable.

 

[cvg]

in order to determine the necessary thickness of your rejuvinated asphalt millings, you will have to do some sort of investigation of the subgrade to determine the strength. I am doing this on a project right now and it will be 5 inches thick on subgrade which is very competent alluvial material. Traffic loadings are very light. If you have subgrade that is not as good as this you may need a thicker application.

 

[chicopee]

Thanks to all the responders.

 

[Ron]

civilperson...I'm not sure where your source came from, but that would produce an awful hot mix. Milled asphalt is typically added as a percentage of an asphalt hot mix. It is added as another aggregate source and doesn't contribute appreciably to the asphalt content. Most state transportation departments limit the amount to about 30 percent.

I agree with coloeng's approach to using the milled asphalt as a covering aggregate. It can also be mixed in-place with existing gravel and sand, supplemented by a few percent by weight of asphalt emulsion (civilperson....is this what you were referencing,perhaps?) and compacted to produce a fairly durable pavement base section that can be left exposed for low traffic applications. It is generally not pervious though. It is a cold mixing process and can be done inexpensively.

 

[msucog]

i'm not sure if your budget can stand this suggestion, but you could always consider a foamed asphalt application. depending on the subgrade conditions, material properties, thickness, etc., you could throw down some millings and pulverize it together. perform the foaming operations then compact. (this is of course a very simplified explanation). enlist an experienced firm to evaluate and test the conditions/materials and recommend a mix design. they should also be enlisted during the construction for testing and consultation.

you might even be able to utilize soil cementing to develop your subbase or partial base course. again, enlist a geotech to see what your options might be based on the project size, budget, desired performance, etc.

good luck