Sealing a cement driveway

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Old 04-23-10, 09:50 AM
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Sealing a cement driveway

A couple of years ago, we had a contractor replace our driveway. For whatever reason, it is not holding up very well in a few spots. My guess is the cement was mixed to wet. We have spoken to the contractor several times and not getting any support. is there a sealer that I can put on to prevent this from getting any worse. There is some light crumbling in places and some pitting.
 
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Old 04-23-10, 12:19 PM
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There are a ton of concrete sealers. Just go to your local Lowes, Home Depot, or hardware store and pick one up. There are many reasons concrete flakes and pits, but number one is the use of de-icing salts or other chemicals during the winter. Even the products that say they're safe for concrete are not. If you have been using some, read the fine print on the label.
If you're not applying de-icers yourself, your car could be bringing them in off the streets and dripping on the driveway. Also, plow trucks and salt spreaders usually throw salt about 10 or 12 feet up your driveway as they go past.
If you're not in a freezeing climate, of course this doesn't apply. However, if you are then I would bet it's the cause of your problems.
 
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Old 04-23-10, 07:39 PM
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I wouldn't seal it. Cut out what's bad & replace it.
 
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Old 04-24-10, 05:17 AM
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I agree with Pulpo, sealing a crumbling concrete won't fix it, and won't keep it from crumbling more. The entire pour was apparently ill-mixed for the weather. Cutting and patching may be the only to way to salvage it.
 
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Old 04-26-10, 08:06 PM
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concrete crumbling

I need to get the contractor back here to look. I think it was ill mixed. We use some deicer in front of the garage, but it isn't crumbling there. It is further down the driveway.
 
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Old 04-27-10, 03:58 AM
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I agree, contacting the contractor should always be the first option. However, unless he is extremely honest, don't expect any real help. He's not going to admit resposibility and take the hit. He may blame the concrete plant.
But take this into account: most concrete batch plants are computerized and have strict quality control standards. It's extremely rare that they deliver a bad batch of concrete. I've seen it, but only about two or three times in 20 years of daily pouring. Most often problems are caused by contractor errors. These can include adding too much water to the truck to make it pour easier and make it more workable, spraying water on the surface and working it in to get a better looking finish, overworking the surface before it's ready and troweling bleed water back in, etc.
Any one of these is a probable cause of scaling and pitting, but believe me when I say that the de-icers are a contributing factor too. As I said, your cars could have dragged it in off the streets, the plow trucks could have thrown it up there, or the stuff you used may have run down with the melt water.
Check with the concrete batch plant that supplied your concrete. Schedule a visit with their quality control guy and have him bring a copy of the batch ticket. It should tell how dry or wet the mix was when batched (slump), and how much water was added to the truck by the contractor. the concrete rep may also have some further insight that we don't. Good luck.
 
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Old 05-05-10, 03:03 AM
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impo, the reason most conc crks is an improper jnt pattern,,, most likely your trouble's caused by too much wtr in the plastic conc &/or ' blessing ' the mud so it doesn't ' set up ' on a hot day while you're crews 1 man short.

rarely does the plant f/u
 
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