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Posted: Mon May 13, 2019 6:48 pm
by loudog
Hi , I have a client who had some concrete carried out on their back yard. She wanted it smooth which the people who did it tried but there are still a few trowel lines. She called me in to see if there was anything I could do, if anyone has any suggestions I would really appreciated it.
Thank you
Posted: Tue May 14, 2019 11:09 am
by doobin
All you can do now is to grind it down. The final finish will depend upon how hard the mix was and how well it has cured. How large an area is it? We do a lot of grinding of small areas, but they are usually well cured. Green concrete doesn't like being ground, and it is hard to get a decent finish that won't damage easily.
You need to be sure she is realistic in her expectations.
Posted: Tue May 14, 2019 4:52 pm
by loudog
It's about 12sqm and been down about 7 months. What machine would I use to grind it down? And is there a slurry I could make maybe add sbr?
Posted: Wed May 15, 2019 4:45 pm
by doobin
For a little area like that, I'd get a double row turbo cup grinding disc for a 9" and do it wet to avoid too much dust.
Any slurry you add will need painstaking hand finishing or even power floating to get it as smooth as I suspect she wants it. SBR mixes don't trowel off very well in my experience either- they're sort of sticky.
Grinding is simplest. This is the sort of thing you need:
https://www.ebay.co.uk/itm....txVZyo-
Double row ones are cheaper and will be fine for an outdoor job- the turbo type ones are just easier to control and make getting a smooth blended finish easier especially after doing patch repairs.
https://www.ebay.co.uk/itm....5.m1851
A 6 x 2 area should only take a couple of hours. Lots of dust, so either a proper grinder shroud and a cyclonic dust vacuum or just do it wet (easiest for you as it's outside)
Posted: Thu May 16, 2019 5:11 am
by loudog
Thank you so much for your help I think what you have said is perfect. Cheers
Posted: Sun Jun 02, 2019 9:51 am
by loudog
Is there any resurfacing products I could use as in with a squeegee. I've seen some but they are American
Posted: Thu Jun 20, 2019 5:51 pm
by Tony McC
We come back to a page I've just mentioned in another thread..... Cementitious Overlay Systems