Reducing small[ish] hump in concrete

phil24_7

cyclonebri1 wrote: »

I've never heard anything so stupid in my life, talk about a sledge hammer to crack a walnut.
Do that and you'll have a crater to fix FFSAKE, repeat do this at your peril.

To be fair he might just be using the incorrect terminology and he was actually thinking of a Kango. A Jackhammer would certainly be overkill, they are used for smashing out serious concrete, although a Kango can do it too, if you are so inclined!

cyclonebri1

I think that's even too extreme to be honest, I go the bolster chisel and lump hammer route, it'll make less dust than any mechanised method.
Make a tent out of an old dust sheet to keep the grit in.

red_imps_2003

cyclonebri1 wrote: »

I think that's even too extreme to be honest, I go the bolster chisel and lump hammer route, it'll make less dust than any mechanised method.
Make a tent out of an old dust sheet to keep the grit in.

Thank you. I will try the old hammer and chisel thing first and then resort to the grinder if I need to tidy up. The area doesn't need to be dead smooth; just fairly level with the surrounding flooring. I don't mind pits in the concrete (I can fill them with sand) but I need to reduce the 'bulge' a tad.

cyclonebri1

red_imps_2003 wrote: »

Thank you. I will try the old hammer and chisel thing first and then resort to the grinder if I need to tidy up. The area doesn't need to be dead smooth; just fairly level with the surrounding flooring. I don't mind pits in the concrete (I can fill them with sand) but I need to reduce the 'bulge' a tad.

Exactly, you don't need to break up the floor by nuking it, :T:T

red_imps_2003

Right, it transpires the 'concrete' was not as hard as I had envisaged. It was probably more like mortar. I was able to scrape quite a bit of it away with a clawhammer and chisel the edges down. I tried the angle grinder on it but the mixture felt almost too 'claggy' for the tool, which just left semicircle indents in the 'cement' canvas. I was left with a rather messy-looking section of ridges and indents. However, the soundboards appear to have fitted over it without obvious problems, so I am not pursuing it any further. Thank you all for your helpful suggestions. I at least not have one or two new tools that will be useful in the future (especially that angle grinder, which has proven useful already).