What Is The Best Approach To Fix Empty Pockets In A Concrete Slab/wall - Concrete, Stone & Masonry - DIY Chatroom Home Improvement Forum
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Old 03-19-2019, 11:44 PM   #1
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What is the best approach to fix empty pockets in a concrete slab/wall


What is the best approach to fix the pockets seen below:


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The pockets were due to the stones in place which did not allow to pass the concrete material, and later on gravity made it's way.
Options on my head:
  • Fill with liquid cement, although it won't be as tough.
  • Fill with concrete, can't guarantee it will make it into every spot of the air pocket, nor sure how to do it well without failing miserably. -Fill with liquid cement and little pieces of rock (one of the 3 components that concrete uses) so it can fill as much as possible and the pieces of rock can fill the big part.
Cutting down the affected parts are not an option.
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Old 03-19-2019, 11:53 PM   #2
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


Horizontal or vertical?



I would apply some bonding agent, mix the concrete, and apply it. It wills settle out and fill pretty well if you massage it in there a bit.
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Old 03-20-2019, 12:42 AM   #3
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


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Originally Posted by Windows on Wash View Post
Horizontal or vertical?



I would apply some bonding agent, mix the concrete, and apply it. It wills settle out and fill pretty well if you massage it in there a bit.
Horizontal connecting to the floor. A bonding agent like "Plasterbond" ? Could you give me an example?


Also from a structural point of view is it that bad? Like is it too weak or not made to last?


Thanks for your input.
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Old 03-20-2019, 12:50 AM   #4
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


If the steel is not SS and it is not at least 1 1/2" inside the concrete it will rust and blow the concrete apart.
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Old 03-20-2019, 06:07 AM   #5
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


congrats, wash & neal,,, i'm still trying to figure out 'due to the stones in place which did not allow to pass the concrete material, and later on gravity made it's way',,, we are fast becoming a people who cannot communicate w/ea other
my bride usually uses words which have relevant meaning to her but only prompt a blank stare OR incorrect answer from me
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Old 03-20-2019, 07:21 AM   #6
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


maybe the rearranged photos will help. . . . . .
if the rusting rebar is an issue, you could cover it with
cardboard, plastic, or something that will give it room
to expand and contract with the elements.
in Florida, we just slam some thick concrete mix into the
cavity, smooth it out and call it a day.

_DRP: posting your location may help a little.
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Old 03-20-2019, 09:42 AM   #7
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


There's no fixing that mess, best thing to do is tear it out and do it right
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Old 03-20-2019, 10:47 AM   #8
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


Bigger pics and more context would help...
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Old 03-20-2019, 06:16 PM   #9
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Re: What is the best approty pockets in a concrete slab/wall


NOW i see what's what,,, a mess, huh ? if it isn't, it'll do til another 1 comes along,,, tnx for the big pics
IF the op's satisfied w/structural integrity, rapid set cement will seal the holes,,, naturally CLEAN prep is of utmost importance,,, yes, wire brushing the steel & coating w/epoxy to prevent corrosion (swelling) would be beneficial
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Old 03-22-2019, 08:29 AM   #10
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


Quote:
Originally Posted by Nealtw View Post
If the steel is not SS and it is not at least 1 1/2" inside the concrete it will rust and blow the concrete apart.

Bill says 4.11MM 2.35x6 MTS 15X15 MTS


I will go to later to the store to confirm.
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Old 03-22-2019, 08:31 AM   #11
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


Quote:
Originally Posted by huesmann View Post
Bigger pics and more context would help...



Yes indeed, I do apologize. This is my first post so I will ensure to keep this recommendation handy for future use. My mobile is having issues transferring pics so probably tomorrow you'll have those handy along with the context.
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Old 03-22-2019, 08:36 AM   #12
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Re: What is the best approty pockets in a concrete slab/wall


Quote:
Originally Posted by stadry View Post
NOW i see what's what,,, a mess, huh ? if it isn't, it'll do til another 1 comes along,,, tnx for the big pics
IF the op's satisfied w/structural integrity, rapid set cement will seal the holes,,, naturally CLEAN prep is of utmost importance,,, yes, wire brushing the steel & coating w/epoxy to prevent corrosion (swelling) would be beneficial

Yes an utter and horrible mess (laughing here, not to cry).
I wasn't aware of the epoxy (clearly of pretty much everything else I wasn't), maybe they already coated it, I will confirm later today.
OP would be me, NO I'm not satisfied, however there is only so much money in my budged to get the job done right but yet learn properly.
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Old 03-22-2019, 08:38 AM   #13
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


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Originally Posted by Canarywood1 View Post
There's no fixing that mess, best thing to do is tear it out and do it right

Chances are I will, but before doing so, more information needs to provided to everyone that is helping so that the context may be well understood and that I do not $%^&* again....
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Old 03-22-2019, 08:43 AM   #14
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


Quote:
Originally Posted by Johnny_inFL View Post
maybe the rearranged photos will help. . . . . .
if the rusting rebar is an issue, you could cover it with
cardboard, plastic, or something that will give it room
to expand and contract with the elements.
in Florida, we just slam some thick concrete mix into the
cavity, smooth it out and call it a day.

_DRP: posting your location may help a little.



More photos to come tomorrow... I'm still putting in the balance to start over or follow your advise and call it a day. I don't like having things done half right and -- Failure is proof that you at least tried ~ now, go do it again, and again, until you get it right -- only thing is that budget MIGHT be a stopper..
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Old 03-23-2019, 01:28 PM   #15
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Re: What is the best approach to fix empty pockets in a concrete slab/wall


how old is this house ? i look at foundation issues & wet bsmnts every day,,, often buyers & owners clutch at seeing crks & other issues,,, IF the house's been standing for 40-50 years, it'll still be standing absent other issues' attack,,, if what i see is what it is, repairs won't break the bank
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