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Concrete Landing Update

Concrete Landing Update

Concrete Landing Update

Just thought I'd give an update on what was going on. Here's the original thread that you can refer to:

Well, after dumping more than 1000 cubic yards of dirt, the pad fill is pretty much done. I'm not sure what type of dirt was used, but it pretty much seemed like the same dusty, loose type of dirt that is oh-so-abundant in El Paso. See the pics below.

I have a copy of the Nuclear Density Test. Here are the numbers:

Location 1:
Wet Dens.- 128.6
%Moist.- 11.1
Dry Dens.- 115.8
%Comp.- 100.7
Opt Moist.- 11.5
Max Dens.- 115.0
Probe Depth- 12"

Location 2:
Wet Dens.- 128.1
%Moist.- 11.9
Dry Dens.- 114.4
%Comp.- 99.4
Opt Moist.- 11.5
Max Dens.- 115.0
Probe Depth- 12"

Location 3:
Wet Dens.- 127.6
%Moist.- 13.3
Dry Dens.- 112.6
%Comp.- 97.9
Opt Moist.- 11.5
Max Dens.- 115.0
Probe Depth- 12"

Quick question. 100.7% Compaction? Is that even possible?

Anyway I'm wondering if these numbers seem to jive, considering the type of dirt used. I should have pictures of the final fill sometime soon.


RE: Concrete Landing Update

Yes, compactions greater than 100% are possible.  Remember that your percent compaction is a percent of a Proctor density which is a density of soil, produced in a lab using specified hammer weight, drop, number of drops, etc.

This gives you a density of X pcf.  In the field, the compaction could be more intense, and this would get you higher densities than the maximum Proctor density.

RE: Concrete Landing Update

JAE is correct - compaction well in excess of 100% of the optimum dry density is achievable.  At least for the existing standard compaction test standards...

I had a job a few years ago where the contractor achieved a mean relative compaction of over 99% with no accepted lift having a value less than 98%.  The fill thickness was very uneven, and he didn't want there to be any potential for the owner to complain about a substandard job -

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