Removing concrete

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I have a slab of concrete in the corner of my garage that needs removing. It is approx 1.2m x 1.2m and about 25cm deep. It is in two layers - the top 8cm or doesn't have pebbles in the bottom part does.

I started by using a chisel attachment in my SDS drill, the first part went quite well, the first 20cm or so was laid on top of the garage floor so it came away easily but after that point it must have been lower. It is now harder to remove and won't leave a nice flat finish - but I can sort that after.

For now though the question is - how do I remove the rest! I've only done a relatively small portion and it is killing the SDS drill! It's getting hot during use and the brushes are sooting up to the point that it won't work until I take them out and file them down - I've done this twice now but would prefer not to destroy the poor thing.

Is there any easier way. I can't really hit it with a sledgehammer with the solid floor underneath. I've read about expansive grout but would be worried using that with the 2 walls either side and the floor below.

So any ideas?!
 
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I can't believe anyone would look at a large body of concrete and think "I know I'll peck away at that with my hand drill". :eek:

You'd be better off using your knob. Surely be, once your drill started melting, it was time to give the thing a rest, no?

As said, get yourself off to the hire shop and stop being a wally.
 
or..... get on ebay .... loads of breakers at cheaper than new prices

you pays your money,

you takes your chance..
 
If my calculations are right , you are having trouble with the bottom 5 cm (25- 20). A sledge hammer will see this off? or drill a series of holes through it in a line which would give you a piece small (or big) enough to handle. Then use a chisel between the holes. The holes will concentrate your effort into fracturing the concrete between the holes.
Frank
 
The bottom section goes down much further into the ground, for whatever reason there must have been a hold there that they filled and stepped up.

I've found a friend who has a titan breaker as suggested above, so will try to borrow that at some convenient point. I don't think the sledge hammer will do anything due to the thickness, the inability to swing due to the ceiling and the fact it has a solid floor underneath.

Will have to leave it for now as I won't be able to borrow the breaker for a few weeks.

Thanks for all the advice though.
 
I eventually got round to borrowing the breaker. It is a Titan TTB280DRH 1700W.

I started using it today - it does go through the concrete faster, however it still didn't really seem up to the job. The breaker has probably had a hard life and minimal maintenance. When using it then silver part closest to the chisel gets really hot, a little black grease was starting to run the chisel. Also sometimes the chisel wouldn't hammer, the motor would make noise but the chisel wouldn't hammer. When I released the button it would start hammering as the motor slowed. This issue seemed worse when the breaker was warm. It works better vertically, when using it horizontally it rarely starts hammering.

Do I need to do anything to try and improve it? Should it be like this? I've managed to remove a bit more, but it will take another 3 similar sessions to get the job done (I spent about 45 mins today before it got too hot)

What would be causing the fault? Is it worth greasing it?
 
HIRE A LARGE BREAKER. NOW.

Haha,

So are you saying the Titan isn't up to the job either?

How much bigger do you reckon I need?

I did do another half an hour today - I was a bit more sympathetic so stopped when it started to get warm. I'd say I was about half way now. I reckon 3 more half hour sessions should see most of it gone.
 
I've read the manual but can't find anything. The maintenance section just says about changes the brushes on the motor. The trouble shooting section just says to check the fuse if it doesn't work and to make sure the chisel is sharp if performance is low.
 

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