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Old 03-01-2013, 12:56 PM   #31
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Best way to fill big hole in foundation


Personally, I wouldn't be using a NS grout for what you're trying to accomplish. There's really no need for a 10-12K psi mix. Not to mention, that stuff is self-leveling and will put more load on your formwork. Standard 4000 psi "quickcrete" mixed relatively wet and poured into the top of the form will suffice. I'd also add a few dowels into the existing just to keep it from potentially "creeping" ahead through time. For pour like this with no access from the top, we'll either remove some concrete at the top to allow the concrete to be poured in, or drill a 4.5" hole into the very top of the forms and attach a 4" PVC street elbow to pour the concrete into and allow for head pressure to ensure it's full..............

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Old 03-01-2013, 02:02 PM   #32
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Best way to fill big hole in foundation


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or drill a 4.5" hole into the very top of the forms and attach a 4" PVC street elbow to pour the concrete into and allow for head pressure to ensure it's full..............
And once its full, you leave the elbow partly full of mix, to harden? Then, after removing form, does that excess which hardened into elbow just snap off?
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Old 03-01-2013, 02:32 PM   #33
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Best way to fill big hole in foundation


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And once its full, you leave the elbow partly full of mix, to harden? Then, after removing form, does that excess which hardened into elbow just snap off?
We typically wait a little while for the concrete to become firm and pull the elbow and replace it with the piece of lumber/plywood we drilled out with a hole saw..........

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