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Old 12-14-2009, 06:05 PM
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Default Builders - How do I roughen up smooth concrete?

The concrete in front of our new building is too smooth and gets slick when it rains. What can I do to roughen it up? Maybe some kind of acid or something? Thanks!
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Old 12-14-2009, 06:10 PM
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Can you add a non skid paint covering?
PITA and costly but it will get the job done.
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Old 12-14-2009, 06:14 PM
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Jim;

How old is the concrete?

One thing you can do is go to your local Concrete Supply Company, such as A.H. Harris (I think they are in your area) and buy a quality concrete sealer that you would spray on with a standard garden type sprayer or you can roll it on with a heavy nap roller.

You would also ask them for a bag of Silica Sand or similar product. Silica is VERY fine. You don't want the sand from home depot or the like, its too rough/course.

Spray the sealer and broadcast the sand on the sealer while it is still fresh/wet. If I were you, I would test this on a small patch away from the front of your building, if for no reason, to practice the sand broadcasting.

A.H. Harris is going to try and overcomplicate the process by asking a 1000 questions, but you really only need a quality sealer, about 100 to 150.00 for 5 gallons.

Good Luck, and if you need the name of a decent sealer, let me know, I can have something sent to you.
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Old 12-14-2009, 06:20 PM
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Jim,

I agree with what Mike said. Thats the simplest solution. Other alternative would be to shot blast it.
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Old 12-14-2009, 06:39 PM
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Mike's suggestion is a good one. Other than that you can bead blast it. Most rental companies have a ride on bead blaster.
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Old 12-14-2009, 06:42 PM
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The concrete in front of our new building is too smooth and gets slick when it rains. What can I do to roughen it up? Maybe some kind of acid or something? Thanks!
Road salt eats away concrete..but for the time being problem solved
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Old 12-14-2009, 06:50 PM
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A ride on bead blaster...that sounds kind of fun. Please elaborate on costs and mess associated with that rig. I'll look into the sealer tomorrow. Mike, if its just as easy to ship it I can buy from you.
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Old 12-14-2009, 06:57 PM
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A ride on bead blaster...that sounds kind of fun. Please elaborate on costs and mess associated with that rig. I'll look into the sealer tomorrow. Mike, if its just as easy to ship it I can buy from you.
We can do 2 things, I can call the Harris in Baltimore and put a 5 gallon pail on my account and you can pick it up to ensure the best price. They can also ship it too you, but they are not far away.

I have some stuff in the shop, but its a different quality than the stuff you may want to use, its like $250.00 and you don't need this high end stuff for what your doing.

you can email me if you want. ect96@aol.com

Of course, you may be able to walk in off the street and buy it cheaper than me, Its not really rocket science, its just a concrete sealer.

How close are you to Inverness Ave. In Baltimore?
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Old 12-14-2009, 06:57 PM
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A torch with a rosebud will break the surface. Muriatic acid will etch it.

Calcium Chloride and concrete don't mix as does rock salt.

I'd try an acid wash first. To rough will look like crap.
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Old 12-14-2009, 07:08 PM
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try the acid wash first (probably $20 bucks of muraitic acid), if that doesnt work the local rental houses (Hertz, Neff, Sunbelt...) will rent a rotary concrete sander - It looks like the things janitors use to polish the floor. Use the rough stones (it will use three or four) and grind the surface. Normally this is used to smooth a rough or uneven surface but using the coarse grinding stones will leave a finish similar to a light broom finish.
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Old 12-15-2009, 05:32 AM
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A ride on bead blaster...that sounds kind of fun. Please elaborate on costs and mess associated with that rig.
Sunbelt rents them. They basically look like a very small scale zamboni . They make a walk behind as well, I suppose it depends on the size of your project. We use these typically when we are pouring a topping slab and the two surfaces need to bond. However, they don't remove a ton of material, they are completey self contained (with the exception of some dust), and they do it pretty evenly so that there are not streaks everywhere.

The sealer with the added aggregate will likely work (not a permanent fix), but be sure to acid etch it at least a couple of times before you apply the sealer.
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Old 12-15-2009, 05:49 AM
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Call your local flooring company and ask them about Ardex,
http://www.ardex.com/product.asp?Con...tCategoryID=24

You can brush this product on and it will bind to the current concrete, by brushing it on you can have a nice texture to it.
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Old 12-15-2009, 05:51 AM
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http://www.sstfloor.com/index.php
These guys are in hanover, md.

Disclaimer: My brother in law works for them
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Old 12-15-2009, 05:07 PM
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Being a concrete man i would rent the grinder first.The last one i rented was cheap,$100 or so and you buy the stones.I was trying to smooth out some really rough concrete and the end result was a good semirough finish.That paint is a real pain in the ass.
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Old 12-15-2009, 05:35 PM
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Quick, run a broom over it before it dries.
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Old 12-15-2009, 06:15 PM
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Walk behind sander with rough grit pads. Get it nice and rough. Then seal it. It will look good and last longer.

The sealer with grit mixed in won't last and will end up coming off unevenly (where people walk).
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Old 12-15-2009, 09:33 PM
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I’ll tell you this much Jim, I for one would NOT be grinding the surface! Your surface is so smooth because who ever troweled it out brought the surface quantities of Portland cement to the surface.....you can NOT make stones a smooth surface, it’s the Portland cement that makes concrete smooth! By grinding/ removing the surface layer of concrete/ Portland you are exposing the sub layer.......that sub layer HAS TO HAVE LESS Portland in it, because the percentage of Portland that was there from the mix is or was moved/ drawn to the surface to make it so smooth! Cutting into that surface HAS to be exposing the sub WEAKER layers! The weaker sub layer will have a lot of stone in it! And stone not held together with Portland cement WILL spall!!!

MD has tough weather conditions and therefore I feel erosion of your surface will happen at an elevated rate....again, especially with the type of weather you guys get! Nope, I WOULD NOT be compromising that surface layer......unless you intend to replace the concrete in 10 yrs because it is really starting to look like crap because the surface is spalling all over the place or in pockets! ?

I think you are behind the eight ball on this one, I think your best choice is to add a finish to the top of it.......if you want longevity out of the concrete.....maybe acid etching is the way to go?
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Old 12-16-2009, 01:20 PM
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There probably isnt any portland in it unless its real old,probably fly ash or something like that.Portland became too expensive and cut into the concrete companys profits.
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Old 12-16-2009, 02:50 PM
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There probably isnt any portland in it unless its real old,probably fly ash or something like that.Portland became too expensive and cut into the concrete companys profits.

Wow
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Old 12-16-2009, 03:00 PM
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Is this on Kent Island?
I'll stop down, again.
You say "The concrete in front of our new building..."
Is this inside or outside?
I don't know the size of the traffic lanes but what about Walk Off Mats?
All shape sizes and colors are available.
Versatile, not a PITA.

http://walkoffmatsonline.com/

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