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Speckert 07-22-2010 05:59 PM

Rust colored stains appearing on new driveway
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Had a new drive way poured and what appears to be reddish or dare I say "rust" colored stains are randomly appearing throughout the the slab. Does anyone have any idea why? See pics for examples...

stadry 07-22-2010 06:04 PM

what has the redi-mix company have to say about their aggregates ? ? ?

jomama45 07-22-2010 06:13 PM

How "new"?

moneymgmt 07-23-2010 07:56 AM

Can't speak for concrete composition issues but have you used any special fertilizers lately? My grandfather used some high-iron fertilizer mix on his yard a while back. Didn't know he spilled some on the driveway until it rained... and stained everything like rust.

Speckert 07-23-2010 10:18 AM

Driveway is about 8 months old. Has NOT been sealed.

Thurman 07-23-2010 10:19 AM

Can't help but wonder because of this: There is a company here, I know the owner, that has "ground-up" concrete waste for years and sold the results to use in driveways and to concrete companies for fill in new mixes. He recently entered into a contract for over 3 million square feet of 12" deep concrete, another contractor is busting this up and bringing it to him-FREE of charge to get rid of it, and to keep it out of the local landfill. He will then crush it in his new 3-stage crusher which will also remove and grind up the re-bar. The old equipment would remove the re-bar for recycling. This new machine will grind the re-bar into less than 1/8" pieces and goes out a different chute. The pulverized concrete and ground-up re-bar are being bought by a local concrete company to be used as fill in new concrete batches. I'm wondering if this old re-bar material could be just below the surface, gets moist, causes rust and then shows up as what you have. The local concrete company is providing the new concrete for replacing what is being removed at the site. Over 3 million square feet at 12" deep--that's a lot of concrete being poured 24/7. David

ferris13 07-27-2010 01:45 PM

When I first saw this pic I immediately thought of fertilizer, just as "moneymgmt" stated.

firehawkmph 07-27-2010 02:25 PM

I have seen similar results from sprinkler systems that use well water.
Mike Hawkins:)

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