4 i can disprove your theory that the concrete will not set up correct due to water ratios.
Pouring concrete under existing wall.
If you re not overly concerned about seams in your slab you can notch out sections of your floor under your walls and pour footing sections to support the wall partially then remove the rest of the wood floor and pour the rest of your slab use re bar extended past through the forms of your first footing sections so they can be tied into the main slab.
A professional foundation crew will construct a one sided concrete form inside the old basement perimeter and pour a new concrete wall.
In this video we take you through the basics of how to remove set up and pour a concrete room with in your own home.
Deck footings closer than 5 to an existing exterior house wall.
Once the truck has reached the end of a section spread the concrete out evenly and a touch higher than the form with a concrete placer rake.
Pour an interior wall.
2 i have tested several types of bags.
This may require jacking up the car port to accommodate.
And if a wall is chipping or crumbling it s fair to say the bag was taken off way to early.
Footings under existing slab.
Pour the concrete in small sections spreading the concrete by moving the chute back and forth and by having the driver pull forward as you go.
1 i have been doing these walls for 30 years.