Proof Rolling?
Proof Rolling?
(OP)
I am going to observe as a building construction inspector the cut that is going to be done in the near future for a parking lot. I was instructed to perform a proof rolling on the cut. I thought you were supposed to do proof rolling to see if there was either a rut or pumping before you do the compaction test using a nuclear guage. Do you need to perform a proof roll observation on a cut?





RE: Proof Rolling?
Further, cutting overburden can expose capillary rise or be in closer proximity to capillary rise of the piezometric surface. Proofrolling will expose such influence and allow you to deal with it.
RE: Proof Rolling?
RE: Proof Rolling?
My question is whether you do proof-rolling on a cut that is going to be filled with another base material. It was decided that a certain depth was to be removed and then filled and compacted to a given proctor value. I need to check the proctor value on the fill using the nuke guage. I thought proof-rolling was to be done on the compacted layer before the nuke guage. I am going to use on this compacted layer a loaded dump truck (20-30 ton). I am not sure what kind of proof-rolling truck to use on a cut.
RE: Proof Rolling?
You should be doing the proofroll on the exposed subgrade before the placement of fill.
This is perhaps more important than proofrolling the surface after placement of fill.
If you have good quality control during fill placement, you have a pretty good idea that the fill has been placed properly, compacted, and free of deleterious materials.
However, you do not know this of the subgrade. As Ron and BigH point out, there could be bad material in the subgrade. Proofrolling will expose these areas of bad subgrade and indicate where further undercutting should be performed before fill placement.
The equipment used is the same regardless of whether you are proofrolling subgrade or fill. A loaded 20 ton dump truck should be adequate.
RE: Proof Rolling?
As for compaction of the exposed cut, sample the soil and get a moisture-density relationship (Proctor) test done in the lab, then do the nuke density testing, followed then by Proctors for the fill and subsequent density testing in each lift of fill.
RE: Proof Rolling?