Procedure for modified proctor on reclaimed asphalt?
Procedure for modified proctor on reclaimed asphalt?
(OP)
Need to find out the proper way to run a modified proctor on asphalt millings with a max. size of 2". The millings will be used under a concrete taxiway.





RE: Procedure for modified proctor on reclaimed asphalt?
RE: Procedure for modified proctor on reclaimed asphalt?
Irrespective of what Ron says, the material will have a "moisture-density" relationship. Your job is to measure the moisture content so it's not affected by the asphalt content.
I'd do a sand cone in the field and contrast that to the nuke gauge.
f-d
¡papá gordo ain't no madre flaca!
RE: Procedure for modified proctor on reclaimed asphalt?
...absolutely the issue and the difficulty.
Why not use the millings as a supplement to soil for stabilization? That works reasonably well.
Agree with Method C and replacement. Also agree with sand cone density.
RE: Procedure for modified proctor on reclaimed asphalt?
Ran 4 points 2,4,6,8 percent moisture and the density has yet to break over. At 8% the water is running out the bottom of the mold.
The inspector on the job said it has to break over but i dont think it will since the water is not replacing the binder as it would in soil!
They want a proctor before they start putting down the millings!
Or am i completely confused?
RE: Procedure for modified proctor on reclaimed asphalt?
Must be a cost savings/value engineering matter, however I do not see how the RAP will allow for proper thermal expansion of the concrete pavement.
RE: Procedure for modified proctor on reclaimed asphalt?
RE: Procedure for modified proctor on reclaimed asphalt?
RE: Procedure for modified proctor on reclaimed asphalt?
The problem with doing this is that the optimum moisture is very difficult to achieve in the field because a material that is free draining to the degree that the water wants to leak out of the mold when performing a proctor is often so free-draining that, in the field, the water drains out faster than it can be moistened and compacted.
RE: Procedure for modified proctor on reclaimed asphalt?
RE: Procedure for modified proctor on reclaimed asphalt?
Actually, now that I think about it, I wonder if perhaps Jade's problem is actually caused by gap grading rather than the asphalt in the material? The maximum particle size of 2" makes me think this is likely unprocessed or minimally processed RAP and therefore gap grading would be likely since most of the fines from the original mix would be bound in clumps of pavement. Also, the problem with a material containing asphalt is usually that you can't get enough water into the material to compact because the asphalt containing fines repel the water. If the problem is that water does mix into the material but too much water is required to stay in the mold, that would point to an absence of fines, i.e., gap grading.
RE: Procedure for modified proctor on reclaimed asphalt?
Bleeding in the test sample at or below the expected optimum tells you something....it tells you that the material is likely gap graded. It tells you that the material has insufficient fines to achieve appropriate stability.