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cyclopean or soil replacement

cyclopean or soil replacement

cyclopean or soil replacement

(OP)
In one of the projects, the geotechnical is advising to rest the bottom of the isolated foundations on 1.5m cyclopean concrete.
This will cost a lot of Money.
I was thinking of replacing the soil by a good backfill soil instead of all this concrete operation.
the buildng is 4 stories height with some large spans (up to 9 meters).
I am looking for some explanations when to go for cyclopean concrete instead of soil replacement.
Many thanks

RE: cyclopean or soil replacement

Unless you are planning to use the cyclopean concrete as a large mat or raft, there doesn't seem to be much of a point in it. Maybe you could post a soil profile/boring log so that we could see the soil conditions below the foundation.

RE: cyclopean or soil replacement

I think the only time someone has suggested something like this to me is because all the area soils were so bad, it was actually cheaper to in-fill with concrete (rather than truck in suitable soils from great distances). Is that the case here?

RE: cyclopean or soil replacement

(OP)
Thank u guys for your help.
Ron, I dont have any boring log about the soil.
WARose, this isnt the case. A good soil for replacement can be provided and it is that far.
So if i understand well soil replacement can be replaced by this cyclopean thing, right ?

RE: cyclopean or soil replacement

str87....it depends on the underlying soils, but likely yes

RE: cyclopean or soil replacement

Gee, I'm getting educated lately. Had to look up "cyclopean concrete". Thanks, Mr Google.

Will the excavation for your footings be the same size as the footing or larger? If larger, I can see that the concrete would help in distributing the load. If the same size, compacted granular material should work, unless there is a concern that the granular filled void would be a reservoir, leading to some sort of degredation of the underlying soils.

RE: cyclopean or soil replacement

Ron:
Would a lean concrete mix be of any use here? And, a replacement for a somewhat more complicated placement process and a more complicated materials handling process?

RE: cyclopean or soil replacement

dhengr....yes, but either will depend on the underlying soils. You're right...replacement is expensive and tedious in confined areas, so can be a good application for a lean concrete mix. We use that method here where we have "sloppy" wet sands and use the lean concrete as a work mat for the footing.

RE: cyclopean or soil replacement

In our area this method would never be cost effective compared to lean mix. The 100lb rocks will cost almost the same as the 3/4" aggregates once one considers delivery and handling costs. Obviously, if you are in an area where the rates are more favorable it might work, but $50/hr laborers plus $120/hr trucking diminishes the savings very quickly. We have found a lot of uses for lean mix in the past years as labor rates continue to rise.

I too had to look up the term.

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