custom concrete jacuzzi demolished. Can I fill the hole with concrete?

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Old 01-16-16, 06:40 PM
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custom concrete jacuzzi demolished. Can I fill the hole with concrete?

Hello,

We have jack hammered, and grinded re-bar out to remove a jacuzzi we did not want on our patio. We can see the existing slab that is was built on, but the bottom of the jacuzzi got filled with rubble as we demo'ed the parts above ground level. We want to fill in this hole and fill in the frame of the existing slab so we can lay some slate tile to match the rest of our patio. Since all of the damage is below the top level of the slab, can we simply pour concrete over the rubble to fill in the holes make the slab level again?
 
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Old 01-16-16, 07:26 PM
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Most likely the answer is yes but the process & materials may differ depending on the depth of the holes that need to be filled. If you could provide that info & maybe even some pics, we could give you a better answer.
 
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Old 01-16-16, 09:18 PM
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Old 01-18-16, 02:26 PM
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The loose rubble in the hole you filled with demolition debris may cause future problems for the new slab poured on top of it, because of settlement occurring over time. Far better slab (and the new tile on top of it) performance can be achieved by placing a layer of compacted gravel on top of the demolition debris first, before placing any concrete.
 
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Old 01-23-16, 06:59 PM
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Name:  20160113_170226_resized.jpg
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This is a photo of the area where the jaccuzzi was--you can see where the outside is the edge of the original slab
 
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Old 01-25-16, 08:58 AM
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In view of the fact that the top level of the debris extends into where you want new concrete to be, you should remove some of it (starting with the larger globs) before adding any gravel. In fact, you might not need any additional gravel, as it appears there are already lots of fines that will compact well. A heavy pole tamper should work well, making sure it's not too heavy for the wife to easily lift.
 
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Old 02-06-16, 06:01 PM
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Thanks for your advice and direction. We compacted and poured concrete. it looks great and still needs about 2 weeks to cure.

Do we really need to wait that long before laying down some slate tile?
 
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Old 02-07-16, 11:18 AM
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If you cheat on the wait time, there's a better chance of tile adhesion problems happening, such as debonding. Read (and carefully follow) the instructions that come with the thinset you plan to use for bonding the slate.
 
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