DGA Payment via Truck Weights
DGA Payment via Truck Weights
(OP)
Im paying a contractor via weight tickets of DGA which in turn gets converted into cubic yardage.
I received a max dry density of 125.8pcf and 10.5% optimum moisture content via test made by an independent lab. We are requiring 95% compaction and stating the moisture contente should be 6% +/- 2% based on the dry weight.
The questions are the following:
1)Im getting a density based on loose dry material and the trucked material has some moisture...is there a way to deduct the weight of the water or is it negligible?
2)I keep hearing about fluff factors...is there a way to determine a fluff factor since we are theretically paying for the voids in the DGA and we want to pay for the 95% compacted DGA.
Please advise on the conversions that need to be done so that we pay only for what is required.
I received a max dry density of 125.8pcf and 10.5% optimum moisture content via test made by an independent lab. We are requiring 95% compaction and stating the moisture contente should be 6% +/- 2% based on the dry weight.
The questions are the following:
1)Im getting a density based on loose dry material and the trucked material has some moisture...is there a way to deduct the weight of the water or is it negligible?
2)I keep hearing about fluff factors...is there a way to determine a fluff factor since we are theretically paying for the voids in the DGA and we want to pay for the 95% compacted DGA.
Please advise on the conversions that need to be done so that we pay only for what is required.





RE: DGA Payment via Truck Weights
The fluff factor doesn't matter when you're buying by weight, but by volume. Are you telling us you don't want to pay for the additional material if your contractor achieves 98% compaction instead of 95%?
RE: DGA Payment via Truck Weights
RE: DGA Payment via Truck Weights
RE: DGA Payment via Truck Weights
Good Luck,
Rick Hassett, P.E.
R.A. Hassett, P.E.
rah1616@hotmail.com
RE: DGA Payment via Truck Weights
The contractor I work for has data on a number of different materials, though they don't like to share since much of the info has come from historical data within the company. However my point is I know these conversions are out there.
The material in the trucks will me lose volume.
Hope that helps with your fluff factor.
RE: DGA Payment via Truck Weights
RE: DGA Payment via Truck Weights
Tyrone718. I think you have to be reasonable in how you approach this. I hope you don't expect the contractor to be able to specify the moisture content of the aggregate he is purchasing and to be able to purchase the exact amount. They purchase by the ton, if there is too much water the quarry will hear about it from the contractors. I suggest just taking the scale tickets for the trucks delivered and using them as your basis. Measure in full truck loads. And next time, don't pay by the ton...
As for conversion factors, just about everyone uses the Caterpillar Handbook, Mining and Earthmoving chapter on production. They've got a pretty good approach.
John Engstrom
RE: DGA Payment via Truck Weights
RE: DGA Payment via Truck Weights
The system as I have employed and will continue to employ regardless of which side of the fence I'm on, requires one major survey, the original bank survey. Then interim surveys per payment period as well as a final survey to wrap it all up. No survey besides the Const. Layout is required at the point of installation as this payment is to the defined neat lines. Other than normal Construction Inspection, nothing additional is required.
R.A. Hassett, P.E.
RE: DGA Payment via Truck Weights