Grind down two inches of concrete made from sand mix

Old 10-01-12, 03:48 PM
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Join Date: Nov 2005
Location: Canada
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Grind down two inches of concrete made from sand mix

The dimensions of my outside back patio is 22ft X 14 ft.
It extends from the back of the garage to the back lawn.
Because there was a slight slope towards the garage where water settles, and because of the old appearance, I removed ( and disposed of ) the old 2 ft X 2 ft concrete slabs.
The base is 4 inch thick concrete.
I used about 42 bags of 30 kg sand mix which covered a little more than half the area.
The average thickness is two inches.
The problem:-
The new slope is bad - real bad. It should be one inch per four feet.
I do not want to break up all that newly poured concrete.
I want to shave off lots of concrete from the lawn tapering back towards the garage.
Is this practical?
Thank you.
Old 10-01-12, 07:23 PM
Join Date: Oct 2008
Location: New England
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Hi ghelp,
I have done some small areas with good success, but not that big. There are machines to do it, but check your local rental shops to see what they carry. I've been on projects where a lot of grinding was required due to a bad pour, but they used big equipment.

The modest area I took down, I used a circular saw with a diamond blade and a wood frame to set the depth. I cut groves every 1/4" and then used a cut-off tool to chip out what remained. Then a grinder quickly finished smoothing everything out.

Being a sand mix it might be rather easy.


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