Existing Slab on ground can be considered as compacted granular fill ?
Existing Slab on ground can be considered as compacted granular fill ?
(OP)
I try to design the RC slab and footing located on an existing slab on ground. This is 1 storey residential bld.
As the soil is high reactive and the owner doesn't want to remove the existing slab as much as possible to save the cost.
The new slab will be located above the existing slab on ground and can be designed as slab on ground or suspended slab with strip footing system.
If the new slab is designed as suspended slab with strip footing and bored pier system, I can ignore the compacted granular fill. Just loose fill as form work.
If the new slab can be designed as a slab on ground with strip footing system (no piers), can the existing slab on ground can be considered as compacted granular filled ? If not, the existing slab must be removed.
Thanks.
As the soil is high reactive and the owner doesn't want to remove the existing slab as much as possible to save the cost.
The new slab will be located above the existing slab on ground and can be designed as slab on ground or suspended slab with strip footing system.
If the new slab is designed as suspended slab with strip footing and bored pier system, I can ignore the compacted granular fill. Just loose fill as form work.
If the new slab can be designed as a slab on ground with strip footing system (no piers), can the existing slab on ground can be considered as compacted granular filled ? If not, the existing slab must be removed.
Thanks.






RE: Existing Slab on ground can be considered as compacted granular fill ?
Not so if there are voids, as the existing slab will have to span the voids, and may not be reinforced to do so, which also locally increases the bearing stress seen by the soil.
Mike McCann
MMC Engineering
RE: Existing Slab on ground can be considered as compacted granular fill ?
I see the internal slab have a big crack (10mm wide approx.). I think that there was a ground movement. That's why I have to be careful.
RE: Existing Slab on ground can be considered as compacted granular fill ?
RE: Existing Slab on ground can be considered as compacted granular fill ?