concrete grinding?

I have a concrete slab, and only part of it is bad (let's say about 2' x 4'), it's kind of weak and crumbles. I've heard the best thing is to use a grinder to remove the weak concrete, and then some kind of concrete repair mix to fill it in. Does this sound right to you? Please include SPECIFICS on what kind of grinder to use?? And which type of mix is best, I see Quikrete makes a few different formulas that sound like they'd work. This is in Ohio, so it will be subject to freeze/thaw cycles. Thanks. Saw idea is good, how thick is a typical concrete slab in a residential garage?

Asked By: Brian D - 6/27/2007
Best Answer - Chosen by Asker
check with some of your local concrete companies... More
Answered By: DREEZZEE - 6/27/2007
Additional Answers (3)
Rent a concrete saw and cut the section that is bad and remove it. If it is on an outside edge form up the edge and pour new. Patching in my experience doesn't seem to work well. Not sure about using Quikrete we always have the local concrete company come pour ours then we finish it.
Answered By: Kyle P - 6/27/2007
You don't need to sand the concrete. Wash with a high powered sprayer to remove all loose or chipped particals. Let dry then repair.
Answered By: Gail H - 6/27/2007
I pour concrete in illinois and with the freeze thaw cycles patches never seem to hold up. I would saw it out and pour new. Something that small you can handle yourself. Rent a saw with a diamond blade saw it out and mix some bag mix 4000 lb or more. Once you pour it back try and keep the salt off it in the winter time... More
Answered By: TALLEYMAN - 6/27/2007
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