U-Fill as Backfill

[Vrpps EIT]

Hi,

When U-Fill (.5Mpa) is used as backfill in between a pit of two foundation walls, will it create any (lateral) force to the foundation walls like soil or it is just a huge piece of concrete block (once it's hardened) and its self-weight is transferred onto the soil beneath it and it doesn't create any potential horizontal load to the foundation walls adjacent to it?
I guess it may be a dumb question but just interested to know about pouring such a huge amount of U-Fill next to the foundation wall of a House.

Thanks!!

 

[phamENG]

No idea what U-Fill is, but if it flows and then hardens, your final condition may be ok. I'd be concerned about the in-between, though. If it has zero strength when poured in, it will be relying on those walls until it does harden and develop its own strength (just like concrete relies on forms until it hardens - if you don't believe me do a search for concrete form blow-outs).

 

[Vrpps EIT]

PhamENG,

It is just a flowfill or unshrinkable fill used instead of Granular mat. for backfill. Yeah it will be in multiple pours.

 

[KootK]

I would normally expect that kind of product to possess enough internal shear strength that it would not laterally load the walls in the finished condition. Some version of those products are marketed specifically for their ability to ameliorate wall lateral loads.

 

[phamENG]

Ok, then the final condition will be fine as KootK mentioned. You'll have to limit the height of each lift based on the ability of the adjacent wall to support the fluid pressure of the wet fill.