How to cut concrete slab in backyard?

[nvelaga]

Hello Experts, 

I am looking to cur the conrete slab highlighted in yellow dotted lines, so that it will match to the newly layed concrete pathway. 

Are there any suggestions ? 

I thinking use Demolition Saw to create a seperation and then get rid of remaining using sledge hammer or jack hammer. 

Does it work ? 

[Jewelleryrescue]

Hi @nvelaga 

You are on the right line of thinking.

But your slab is only 75mm thick so if you  use and angle grinder either even a 100mm disk will work with a diamond or masionary abrasive or multipurpose  disk.  Use a  circular  saw too  but the diamond  blade is bigger and more expensive for a  one off cut.

The  purpose of the cut line  is to proved a neat controlled fracture line so when you use  a jack hammer closer to the cut line it will  break along the line only.

Use the sledge or  jack  hammer to break up larger lump so they are easier to  handle  Smashing em too small is creating  more work so stop at largest managable size/

The last 20mm of the uncut path will be raggedly as it wont be cut  all the way though  so just  use  your angle grinder and  blade to tidy it up flat.

[nvelaga]

Thanks @Jewelleryrescue.

I wasn't aware circular saws are handy for concrete as well. I have Ozito circular saw , if i purchase a diamond blade ( diablo )

Does the saw sufficient for the job ?

[Jewelleryrescue]

Hi @nvelaga 

The  trick  with ozito power tools is to let the tool do the work as they are no where as powerful or robust as their heavy duty cousins. Or full on concrete specailist tools.

I would set the ozito depth guage  for 10mm and score a nice neat saw blade cut down the line this will also not over tax the saw.

Just slow and steady and apply light to medium forward pressure to the saw. Lower depth 20mm and  go again the first cut will guide the blade so feel for that with the blade working less hard

-Cutting notes You  must  wear  good dust mask, goggles and hearing  plugs.

-When your  cutting there will be massive amount of  dust be  considerate of your neighbours  cars and washing on the line etc.

-When your  cutting your marker line may be covered in dust so be prepared to stop.  Some times an air blower held be  an observer  can clean the way/line ahead. They  must be protected to.

- Attach an old  vacuum  cleaner to your ozito dust  exhast port it will help some cement  dust is very fine and  start to trash a good  vacuum. 

-You will have to move your position several time  to traverse the cut line make sure you power the saw off and it stops spinning before you try to move to  relocate as a saw can give a very nasty and dangerous  kick if the blade is turned /Twisted deep and jambs while spinning deep into the  cut.

- Position your self to the side of the saw not behind it in case of kick back

Kneel at ground  level to cut  dont try to stand and cut bending over as your level of control will be mininal Always have a clear  work zone and good  cutting posture and you are proprtly balanced  and Dont over extend your reach as your control will weaken.

Sorry to bomb  you with this stuff but saftey is very import and around power tools you wont get  too many second chances just ask people at the emergency dept.

[nvelaga]

Thanks @Jewelleryrescue. Appreciate your inputs. Totally inline, safety is paramount. 

[EricL]

Hello @nvelaga 

It's great that you've received good advice from @Jewelleryrescue. I just wanted to reiterate the message of safety. In this particular instance it's a must to wear protective clothing such as thick long-sleeved shirt, pants, safety shoes, gloves, goggles, heavy duty hearing protectors and a proper dust mask. Aside from those always take into consideration people who are living with you and your neighbours. Their safety is important as well.

If you need further assistance, please let us know.

Eric