I’m looking for someone willing to share a spec section for polyjacking (pressurized polyurethane grouting for slab lifting). Is anyone able to help me? Thanks.
Try these guys as a starting point.
http://www.haywardbaker.com/WhatWeDo/Techniques/Grouting/CompactionGrouting/Specifications/default.aspx
I just had a project needing compaction grouting and the geotechnical engineer liked their sample sections.
Thanks, but these appear to use Portland cement grout, and for different purposes. I’m looking for something to be injected, in conjunction with perimeter underpinning, to raise a slab on grade where the soil has shrunk, and the substrate grade, as a result, is now lower…a sunken slab.
They have that specific topic as well. I did a little poking around after I sent the prior comment.
http://www.haywardbaker.com/WhatWeDo/Techniques/Grouting/PolyurethaneGrouting/default.aspx
This one is not a 3-part SectionFormat document. But, it does have the technical content that should get you what you need to write a proper section.
Yes, that’s it. I looked around somewhat on that site Friday, but apparently didn’t poke around in the right place, or long enough. Thanks for finding it, Richard!
Slab jacking has been done using Portland cement grout. Why do you need to use polyurethane grout?
Seems as if the the literature cited above cited some advantages over concrete grout. Since I was asking on behalf of our structural engineer, I didn’t read it in detail, but I think expansion in place (adjustable by formulation, etc.), light weight, and perhaps water resistance are factors. I believe the expansion produces the pressure, not (just) the force of injection.