Alright - Cement stabilized sand was used and passed the compaction and compressive strength test. The sub-base also passed compaction.
The contractor is now placing rebar. Again the slab is 8.5" - and the rebar is single mat #4 12" ocew. I have calculated the depth to rebar (From top of...
Two borings with shelby tube;
K = Effective Modulus of subgrade reaction for base = 600 pci
The soil is coletche.
Another alternative for 6% lime is cement stabilized sand.
Alright - Geotech Survey has been completed. The soil was in good shape, k = 600 pci.
8.5" concrete reinforced, 6" crushed limestone with little or no fines, 6" stabilized lime or cement stabilized sand.
Sorry been away for a while dealing with different problems. Update - a geotech firm is hopefully coming out tomorrow to take a look. I want this work guaranteed!
diggerman - if the concrete is too thick, cracking will occur during curing.
yeah the area holds water due to the concrete that has settled, but we are also looking to put another drain in to help this problem. There is only one drain for about a football sized lot.
cvg: I plan to excavate at least 18" and backfill compacting 6" lifts. Silly enough the company doesn't seem to want to pay for a new geotech survey. Basically they just want a free recommendation from a geotech. I would think a geotech survey, however, would benefit in the long run.
Ron...
Sorry I got pulled off this project at work for a while, but this is what the contractor came up with.
For Failing Concrete
7" single matt, 4000 PSI 5.5 Sack, #4 12" OCEW, #6 dowels 18" OC with epoxy
Well after a few days I figured out my critical load - Hyster 550 forklift. The critical axle load is roughly 117 Kips. This is why pumping is occuring.
The company isn't sure they want to pay for a Geotech report. Not sure how to design without knowing subsurface condition.
Also wanted...
Lastly does anyone have any good design references for designing the concrete. I'm a bit lost for reinforcing/non-reinforced, slab thickness, dowel placement.
I don't, but working on it, and right now that is the main concern I have...I'm not sure even if the concrete is level with the surrounding concrete it will drain properly.
My thought is to tie in at least one drain if not two. I don't think that the slope was done correctly.
Can this be used when the water table is high? Would this cause more problems if the joints weren't properly sealed?
Also thanks for everyone's help. It is greatly appreciated.
Yes sorry control joints with foam type product.
It looks as if the subgrade is being pumped up...it hasn't rained in 10 days and all the spots where this is occuring is muddy and wet. It appears that shrinkage has occured.
Yeah that is my guess. The loads are extremely large with the heavy...
Are you refering to the soil taking moisture from the concrete? Wouldn't this only happen if the concrete was placed directly on this clay.
The slab looks to be about 8 inches?
Between expansion joints, shouldn't there be dowels or a key way. It seems the concrete wasn't dowled or the dowels...
