Recycled Concrete Road Base Compaction
Recycled Concrete Road Base Compaction
(OP)
HAs anyone had experience using this stuff. It is aggregate Road Base CDOT Class 6, if anyone is familiar with CDOT. But the compaction keeps coming up in the low 90's with a modified proctor, moisture looks good.
The contractors seem to be laying it in there and compacting it with a vibratory roller, I'm thinking they may need a larger one.
I'm just curios if there is some reason with recycled concrete that it wouldn't meet compaction. It basically looks like aggregate with concrete powder more or less. I didn't notice and visible chunks of concrete in the stuff.
The contractors seem to be laying it in there and compacting it with a vibratory roller, I'm thinking they may need a larger one.
I'm just curios if there is some reason with recycled concrete that it wouldn't meet compaction. It basically looks like aggregate with concrete powder more or less. I didn't notice and visible chunks of concrete in the stuff.





RE: Recycled Concrete Road Base Compaction
RE: Recycled Concrete Road Base Compaction
RE: Recycled Concrete Road Base Compaction
RE: Recycled Concrete Road Base Compaction
RE: Recycled Concrete Road Base Compaction
Ron, shouldn't the hydration process be totally finished after the concrete was initially poured, or can some cement be left over if enough water isn't used?
RE: Recycled Concrete Road Base Compaction
I expect that the problem you saw had a lot more to do with the thickness of the lift and using he wrong kind of compactor. I would be willing to bet that the sheeps foot roller DID cause at least some of the concrete to crush, thereby creating more fines and making it harder for the contractor to get compaction.
I would recommend using a vibratory smooth drum roller along with wheel rolling to compact this type of material with loose lift thicknesses of ~9 inches.
RE: Recycled Concrete Road Base Compaction
The new roller really shook the base course and that did the trick, we ended up with compactions from 95.5 to 98 percent of the modified.
This looks like really good material to me and actually prefer it over regular base course. It actually seems to harden up a bit on the surface after it gets wet and is more stable, especially if you have traffic on it than just rock base course. I guess if I learned anything from this, make sure that your base course is properly processed at the plant and broke down enough so that there aren't any larger concrete pieces in it (pieces you can see) because if you need to wack it hard it'll probably crush and change your material properties.
RE: Recycled Concrete Road Base Compaction
RE: Recycled Concrete Road Base Compaction
RE: Recycled Concrete Road Base Compaction
RE: Recycled Concrete Road Base Compaction