Asphalt Grindings Density in a finished Aggregate Base Road

[Riversidean]

Hello Engineering Community,

Does any know what a typical finished road surface density would be using Asphalt Grindings as an aggregate base road? Let's say compacted to 95% to 100%?

Currently we have the asphalt grindings in a small material pile and from traffic tickect tonnage and a survey volume comparison we have a density of 118 pounds per cubic foot which I heard is equivalent to well compacted sand. The asphalt grindings were "tieded" up or consolidated into a pile by a dozer and gained some compaction.

Any help would be appreciated,
Riversidean.

 

[Ron]

Sorry, but I don't understand your issue. You seem to be discussing several diverse points.

First, milled asphalt can be used as a base supplement, but should be mixed with other aggregate to achieve appropriate stability.

Base material for pavement should be compacted to at least 98% of the modifed Proctor maximum dry density.

If you are using milled asphalt as the only material in the base, then you need to used another method of compaction comparison, as the modified or standard Proctor are not appropriate for asphaltic materials, since you can't reasonably develop a moisture component of the curve. It can; however, be mixed with a small amount of portland cement and asphalt emulsion to obtain a very good base material.

118 pcf is a relatively high density for granular materials of specific gravities in the 2.6 to 2.7 range. It is higher than a typical sand density, but not completely out of the realm. I'm not sure why you are making a stockpile density comparison to an in-place density requirement....those don't equate.

 

[cvg]

it sounds like you are using the millings for the road, no asphalt on top. I would specify rejuvination of the millings and then at least two passes with a roller in each direction to get adequate compaction.

 

[BigH]

If OP is doing what cvg suggests, then I would suggest that he treat the material as one would cold-in-place recycling. Rejunenate, as Ron says with some new emulsion or pen grade bitumen and also portland cement.

 

[Riversidean]

@Ron

Sorry I forgot to mention that I was trying to get a compacted density for material placement. The material is at the moment keeping its shape well and does not rut much or act "fluffy" where a more traditional aggregate base may. This is why I was using it to get an idea of the possible "compaction" density until I got better values.

@cvq & BigH

After talking with a fellow agency that has been using the material it seems like the cold-in-place method may work well. Yes the road will not have hot mix asphalt of any kind on top of the milled asphalt. The road will simply be compacted milled asphalt possibly treated with additional materials.

After speaking to different agencies I was informed that the milled asphalt fully compacted on average has a density of 125-126 lbs per cu ft. I was mostly wanting to get an idea of the potential compacted density to see how much base road we could put down using the material.

Thanks for the tips,
Riversidean