*
Jim – I’ve done a form of “mud jacking” with an old style tire hand pump. The cylinder was about 1″ in diameter and the top cap was held in by two screws and could be removed. My driveway had settled on a corner of one section. First I drilled a hole in the low area, then filled the tire pump with a very thin cement/water mix, inserted the hose in the hole (make sure the hole-to-hose diameter is a tight fit) and forced the mix to flow between the slab and the dirt. The pressure (pounds per square inch) that is created is high compared to the weight of the concrete and the slab will come up. (A 1″ cylinder with 175 lb. of force applied will result in 175 psi pressure.) If your slab is still level, you can just pump the mix into the void and it will set-up.
Discussion Forum
Discussion Forum
Up Next
Video Shorts
Featured Story
The Van Mark Trim-A-Table TAT60 works with both right- and left-hand saws and does not require the saw to be attached to a special plate that slides in the rail guides.
Featured Video
Related Stories
-
Podcast 609: Flashing a Metal Building, Energy Retrofits, and Siting a House -
Podcast 609: Members-only Aftershow — Building Business With Timber HP President Matt O’Malia -
Podcast 608: Roofs with Self-adhered Membranes, Heating and Cooling Loads, and Introducing People to Trade Work -
Podcast 608: Members-only Aftershow—High-performance Building with Mainstream Methods and Materials
Highlights
"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.
Replies
*
Jim - I've done a form of "mud jacking" with an old style tire hand pump. The cylinder was about 1" in diameter and the top cap was held in by two screws and could be removed. My driveway had settled on a corner of one section. First I drilled a hole in the low area, then filled the tire pump with a very thin cement/water mix, inserted the hose in the hole (make sure the hole-to-hose diameter is a tight fit) and forced the mix to flow between the slab and the dirt. The pressure (pounds per square inch) that is created is high compared to the weight of the concrete and the slab will come up. (A 1" cylinder with 175 lb. of force applied will result in 175 psi pressure.) If your slab is still level, you can just pump the mix into the void and it will set-up.
*
is there such a thing? back patio 10x10 seams to have at least a 2-3 inch void between slab and grade.
thanx for any suggs
jim
*What the hell is mudjacking?If you need to pump some concrete under a slab, I saw a home made device for this in FHB May 2000 issue 130.Attached sketch.
*
I know a guy who is a mud jack in Colorado - what a coincidence!
He likes it when malls call him.
The tire pump may work. Detrmien the area needing jacking and the slab thickness. Concrete is 120 pounds per cubic foot divide the weight by the area and you will know how much pressure you need.
I am not sure I would do it myself though.
-Rob