Removing Poured & Reinforced Concrete Slabs

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rchesterton
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Removing Poured & Reinforced Concrete Slabs

Post by rchesterton » Tue May 08, 2018 7:54 pm

I have thick, poured, steel-reinforced concrete slabs for my sidewalk and would like to remove them. I rented a jackhammer and after an hour of pounding on these slabs with three different bits there was hardly any progress. Is there a recommended way to remove this type of slab?

BTW - I am doing this to put in pavers that match my patio and widen my walkway.


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A. Spruce
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Re: Removing Poured & Reinforced Concrete Slabs

Post by A. Spruce » Tue May 08, 2018 9:01 pm

With steel reinforcement, whether rebar or wire, you're definitely going to have a tough time breaking it up. A 60 pound electric jackhammer doesn't really have the punch for such things, but with effort it will work.

A few things to try.
1 - Try to take off small pieces, chisel off corners.
2 - Do a perforation line, run the point every 2-3" to crack all the way across, then start working smaller and smaller pieces from there.
3 - Until you expose the reinforcing and are able to cut it, the concrete itself isn't going to separate all that easily, it takes a lot of time and effort. That's the whole point of the reinforcement, it doesn't let the concrete move.
4 - If you can undermine the slab or crack off larger pieces and get a block under them, then work at it. Without full support of the ground, the concrete will fracture more easily.

As for cutting the reinforcement, an angle grinder or reciprocating saw will take out rebar, bolt cutters will take out wire.
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Shannon
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Re: Removing Poured & Reinforced Concrete Slabs

Post by Shannon » Tue May 08, 2018 9:21 pm

Another option may be to have a demo company come in with a skid steer to break it up and haul it away
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A. Spruce
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Re: Removing Poured & Reinforced Concrete Slabs

Post by A. Spruce » Tue May 08, 2018 9:33 pm

What the?!??!?!!? That's like cheating! :o :lol: :lol:
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jkpeter
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Re: Removing Poured & Reinforced Concrete Slabs

Post by jkpeter » Wed May 09, 2018 5:22 am

I did it by renting a concrete saw (a larger lawn mower sized saw) it has a diamond blade and could cut down 6 inches.
I made cuts about 2 feet wide and then hauled off the chunks, but you can cut as small as you can handle.
The saw cuts right through rebar or wire mesh without issue. And rental is pretty cheap (about 100 for a day with blades) much cheaper than any excavator.

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Shannon
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Re: Removing Poured & Reinforced Concrete Slabs

Post by Shannon » Wed May 09, 2018 7:17 am

Its a lot of cutting to make hand manageable pieces but it would work.
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rchesterton
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Re: Removing Poured & Reinforced Concrete Slabs

Post by rchesterton » Thu May 24, 2018 9:01 am

I ended up renting a skid steer with a breaker on it (a massive jackhammer). My God that was fun. Shook the whole neighborhood! Got'er dun.

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A. Spruce
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Re: Removing Poured & Reinforced Concrete Slabs

Post by A. Spruce » Thu May 24, 2018 11:11 am

That's cheating! :o :lol:
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Shannon
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Re: Removing Poured & Reinforced Concrete Slabs

Post by Shannon » Thu May 24, 2018 6:17 pm

Nothing like a diesel powered machine to get you feeling invincible !
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