So many kinds of cement, HELP


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Old 07-18-09, 01:51 PM
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Exclamation So many kinds of cement, HELP

I have to raise the edge of my sidewalk about 2 inches, then feather it out to other edge. My sidewalk has sunk over the years and water is draining the wrong way every time it rains.
I tried to lift the sections thinking I could shovel some stone under it to raise it. Can't begin to lift them, so the next best thing is to pour a new edge on the low side.
What is the difference between all of these kinds of materials? There is vinyl patch, top and bond, concrete, sand mix, mortar mix,the list goes on and on. I want to use Quickrete or something like that since it's such a small project.
I assume I need concrete on the deepest part, but how do I deal with the stones when I get out to the other edge? Can I mix different products to get the results I need????
I already have the bonding liquid to make the old adhere to the new, I just don't know how to get to where I need to be as far as tapering this thing.
 
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Old 07-18-09, 05:04 PM
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The vinyl patch or top & bond are fine enough to feather out to nothing. Usually the directions will say that if you want to apply thicker than an inch or so, to add pea gravel to the mix. Just read the labels and see what they say. Good luck.
 
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Old 07-18-09, 05:59 PM
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Pecos
Thanks, is there some easy way to calculate how many bags I need to buy? I think the bags weigh 40 lb. each. The area is an arc that is 4' long on the short side. Where it meets the step is 6' (that's where I need a couple of inches, on those 2 sides). The long side of the arc is 6' too, but it will taper from 2" out to feather to the far side of the 4' and 6' sides of the arc. How much pea gravel can I add before I compromise the strength integrity?
 
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Old 07-19-09, 06:40 AM
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The yield will also be on the bag, but of course the amount of pea gravel you add will affect it. As to how much pea gravel before compromising stength: the pea gravel is stronger than the cement that holds it together. The cement is simply the "glue" that holds the aggregate together. That's why using straight Portland cement won't work as a patch. It's just glue that is holding nothing together, and has zero strength on its own.
I would guess that a couple of bags would be enough, but I didn't calculate anything. First mix up enough with pea gravel to fill in the deep parts down to about 3/4 to half an inch thick, then feather it out with the material without pea gravel.
To get it to stick well, prep is everything. Make certain that the area you're working on is absolutely free of dirt and contaminants before applying your material. Pressure washing or (acid etching followed by neutralizing) would be preferred. Keep in mind that your patch will NOT match the color of the existing concrete, and probably never will. Good luck.
 

Last edited by Pecos; 07-19-09 at 06:42 AM. Reason: additional info
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Old 07-19-09, 08:59 AM
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Got all my stuff and D..... if it ain't rainingBeer 4U2
 
 

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