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yako123 12-15-2009 10:09 PM

Removing layer of concrete
Is there a way to remove an 1.5 inch thick layer of concrete 10 inches by 20 inches in area off a 8 inch thick slab thats maybe 30 by 20 feet dustlessly ? Yeah its like a small little pit. Will those dustless surfacing grinders work or do they generate too much dust or they won't dig that deep? Will those non explosive expansive agents work (dexpan or sylentmite) or will they break through the slab ? Thanks

ccarlisle 12-16-2009 07:28 AM

Remove a pit? don't follow...:huh:

A rented jackhammer is the least dusty method of grinding concrete.

Scuba_Dave 12-16-2009 07:33 AM

If its not bonded to the concrete underneath a sledgehammer may crack it up to be removed

Why are you removing the concrete ?

yako123 12-16-2009 07:35 AM

A jackhammer seems like it will break through all 8 inches of the concrete. I just need 2 inches off the 8 inch thick slab.

The concrete smells, i think it has something spilled on it. I figured remove a layer of it and pour concrete over it.

Scuba_Dave 12-16-2009 07:43 AM

So you want to remove 1.5" from a slab that was poured 8" thick?
Not a 1.5" layer poured over a 8" slab

If so...Good luck...that is a ton of work
You would be better off having it professionally cleaned

ccarlisle 12-16-2009 07:56 AM

We use a small electric jackhammer -more like a hammer drill - to break up inches of concrete in shower stalls...come witha one-inch blade bit that does nicely. But before resorting to that, what have you tried to reduce the odour - or is it just ugly-looking. Is it outside?

yako123 12-18-2009 07:45 AM

I tried cleaning it with some liquid tide and water. Does the small jackhammer breakthrough the concrete or just the top layer of concrete ?

ccarlisle 12-18-2009 07:56 AM

Concrete is porous; something liquid has gotten in to your concrete andn settled there. If it smells, it's probably something organic that is now decomposing, like milk does. Use bleach or hydrogen peroxide to kill off the bacteria that are responsible for the smell. Several applications may be necessary - just pour it on and let it dry.

If you are wroried about using a jackhammer, find someone who has a concrete saw and cut a line around the part you don't like, then jackhammer that part out. It'll make some dust, tho.

Even if you crack the concrete, that can be fixed...but if you just chip away at it only little chunks will come off. Have a picture you could show us?

johnmwentz 12-18-2009 11:20 AM


Originally Posted by ccarlisle (Post 368599)
but if you just chip away at it only little chunks will come off.

Well I think using a small sledge hammer and chisel would be the best way but would require more sweat.

Adela 08-15-2010 03:35 AM

Concrete shaver??
I had the same need to remove a layer of concrete - but throughout the entire house. I found the previous replies useful, but I wanted to ask about the various concrete shavers that are advertised on the net...has anyone tried them? How much can they remove? Are they useful for a large area?

jogr 08-17-2010 09:38 PM

I would find another solution to the problem rather than shaving off a layer of concrete. What is the problem you're trying to solve?

stadry 08-18-2010 02:12 PM

there's enough replies on this thread to sink the sob :laughing: large breaking guns are called ' jackhammers ' & can range from 60# electric to 90# pneumatic,,,smaller guns are called ' chipping ' guns &, typically, are 30# or less - air OR electric,,, rent the electric bosch ' bulldog size ' ( small ) w/point & chisel bit ),,, you could also rend a scabbler or scarifier ( walk-behind or hand-held ) but no one but a pro rental yard OR a pro has them.

have NO f'n idea what a ' concrete shaver ' is :no:

Adela 08-24-2010 08:56 PM

removing layer of concrete
To answer your question jogr: I bought a stone home (built 1890) which would have originally had floorboards (as was the style of Australian cottages then). The floorboards must have become unsatisfactory (for whatever reason from rot to fashion change) and has been replaced by concrete (I estimate anywhere from late 1960's-1980). This made the rising damp (or Salt damp as it's called in the state of south australia) a problem as it bridged the original damp course and eliminated air flow. after speaking to an expert in rising damp removal, he suggested that the entire concrete floor should not be removed as it is now "part of the structure of the house". However, the floor is uneven and I do not want to raise the level of the floor by simply adding a layer of self leveling concrete. Therefore, I think a layer of concrete should be removed, I can then add some in-floor heating and cover with self leveling concrete.Job done (eventually).

Thankyou to "itsreallyconc" the chipper sounds like what I need. And yes, I meant scabbler or scarifier - but the word escaped me at the time.:gunsmilie:

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