Shotcrete for new wall construction
Shotcrete for new wall construction
(OP)
Has anyone done perimeter multi-storey basement retaining walls with shotcrete?
If so, what are your experiences with it in terms of getting it done right (no voids, no sand pockets, fully encapsulated rebar, etc.) as well as quality and appearance of surface finish?
If so, what are your experiences with it in terms of getting it done right (no voids, no sand pockets, fully encapsulated rebar, etc.) as well as quality and appearance of surface finish?






RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
I'm not sure what products are common for multi-level commercial basements, but in the residential world Grace Construction Products are what we run across most commonly. Preprufe is what is normally used for basement waterproofing around here. It's very expensive, but a good system from what I understand (but again we never spec waterproofing).
It looks like their product is intended to be used as blind-side waterproofing for shotcrete.
https://gcpat.com/construction/en-us/waterproofing...
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
1) Thank you jdgengineer for the link to Preprufe waterproofing video. There is no commentary to the "Preprufe" waterproofing video, so I am assuming this requires both a blindside membrane and a grout injection after the shotcrete wall is finished. My gut feel is that if a smooth finish is required for appearance sake on the shotcrete, and both a membrane AND grout injection is required to render it waterproof, that this is going to be an expensive system. So Sandman when you say that shotcrete is cheaper, my question is: Is that with this waterproofing system and with a smooth finish. I also have reservations about relying on the grout to spread out all over so that there is no location without grout.
2) If the perimeter wall has structural columns that project into the building (example say 12" thick wall with 24" thick columns which project 12" into the building) would that still be a candidate for shotcrete?
3) To Sandman21: Is it a typo where you say "...on multi-story basement I have not heard or seen cast-in-place being used in large applications"? Did you mean to say that you have not heard of shotcrete being used in large applications on multistorey basement walls?
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction
Hi Sandman - What you say is is very interesting but astounding to me (I am assuming that you are an independent engineer and not working in the shotcrete industry - right?). In my 53 years of consulting structural engineering practice here in Ontario, I cannot recall ever encountering a multistory basement wall that was shotcrete, although we recently became aware there may be a few buildings so constructed recently. Ditto for the engineers with our competitors with whom I have spoken on this issue. I honestly cannot see why anyone would elect to shotcrete rather than cast-in-place unless it can be shown that it was significantly more economical. In the shotcrete case, the waterproofing membrane would be damaged by the force of the shotcrete hitting it, so it seems that is why they add a grouting operation to render the wall waterproof, but this grouting is expensive and time consuming and of uncertain penetration.
Be interesting to hear from others on their feelings pro an con on shotcrete multistorey basement walls (for parking areas) versus cast-in-place, assuming the wall must be waterproofed.
I am also interested in answer to my question about columns that project from the wall:
2) If the perimeter wall has structural columns that project into the building (example say 12" thick wall with 24" thick columns which project 12" into the building) would that still be a candidate for shotcrete?
RE: Shotcrete for new wall construction
RE: Shotcrete for new wall construction