Cement Treated Base Shrinkage
Cement Treated Base Shrinkage
(OP)
I have a contractor who is claiming to have put 320 CY of CTB in an area that called for 240 CY. I have his haul tickets to verify the amount of CTB he placed and a representative onsite that verified that little to none of the material was wasted. I have a topo of the area's subgrade and though the subgrade was not perfect, it does not account for that large of an overrun. Am I missing something ? Can CTB shrink by 25% when compacted to a density of 98 % at 1 foot in depth ? I can not seem to come up with a reasonable explanation of how this is possible.





RE: Cement Treated Base Shrinkage
Do you have confidence that his haul tickets are accurate? Have you done a rough measurement of the truck volume to validate?
RE: Cement Treated Base Shrinkage
you are only verifying tons, not cubic yards (check your density calculation) and not elevations of either subgrade or finished grade (check your surveys)
RE: Cement Treated Base Shrinkage
This is why some DOT's pay by the SY in place at a required thickness.
Is your subgrade low PI sand?
Were the haul trucks bobtail (3 axle)?
Generally speaking, if the haul truck volume calc.s check out, and they were not showing the top of the material to be at water level full.....
I think he is trying to take you to school.
RE: Cement Treated Base Shrinkage
RE: Cement Treated Base Shrinkage
Agree with drumchaser that the contractor is probably trying to school someone.