Meaning of Passes
Meaning of Passes
(OP)
Problem:
Specification says that the contractor shall carry out 6 passes of a 15 ton vibrating smooth drum compactor.
What is a pass?
Is it a round trip?
Is it a single pass-over?
Most specs are "mute" on this. Wanting to see what kind of variation in responses - and by country.
![[cheers] cheers](https://www.tipmaster.com/images/cheers.gif)
Specification says that the contractor shall carry out 6 passes of a 15 ton vibrating smooth drum compactor.
What is a pass?
Is it a round trip?
Is it a single pass-over?
Most specs are "mute" on this. Wanting to see what kind of variation in responses - and by country.
![[cheers] cheers](https://www.tipmaster.com/images/cheers.gif)





RE: Meaning of Passes
My vote- a single pass-over.
Do compactors always retrace their paths?
Alaska, USA.
RE: Meaning of Passes
I don't think I've ever had this issue come up before.
If I was a contractor who read that statement, I would do 3 trips out and back. I don't think I'd take it kindly if an engineer told me I had to do more.
RE: Meaning of Passes
RE: Meaning of Passes
RE: Meaning of Passes
RE: Meaning of Passes
f-d
¡papá gordo ain't no madre flaca!
RE: Meaning of Passes
RE: Meaning of Passes
RE: Meaning of Passes
Each time rolling over same area is a pass.....from jgailla's land
RE: Meaning of Passes
If, after you make a pass, she engauges...then you could be in for a round trip.
RE: Meaning of Passes
I'm still interesting in those practicing in SE Asia or in the sub-continent to please give their understanding . . .
RE: Meaning of Passes
RE: Meaning of Passes
RE: Meaning of Passes
RE: Meaning of Passes
Have you ever done an experiment to see how much the vibration helps the density of clay? For a fairly small fill, the contractor brought a small radio-control vib padfoot. The vibration made a very small difference in the density, but that was the difference between barely making the density spec and just missing it.
DRG
RE: Meaning of Passes
RE: Meaning of Passes
Dik
RE: Meaning of Passes
RE: Meaning of Passes
Dik
RE: Meaning of Passes
RE: Meaning of Passes
If your spec is by percent of proctor, why be concerned about the number of passes?
RE: Meaning of Passes
RE: Meaning of Passes
RE: Meaning of Passes
RE: Meaning of Passes
As much as the Contractor would like to just windup and go on a project, they need to adjust for actual conitions. Can I get density in 3 passes, maybe if the moisture % is just so. It is usually the Contractor's "means and methodology" to balance if they want to cover the cost of additional moisture (a water wagon) or drying (disking and waiting) versus adding additional passes with the roller to achieve target density.
All that being said, the 6 pass specification is more of a performance specification and opens the designer and owner to liability for field conditions they can;t really control, some of which are present by the Contractor's choosing (ie. moisture, equipment - too heavy or too light of a roller, ...)