Acid Rust Holes in Driveway?

[WizBang]

We cut a pretty large HOA and today one of the customers accused our mowers of leaving rust-colored spots on her asphalt driveway. She insisted she saw our mowers do it.

I take a look, and i see rust spots the size of quarters eating away at her driveway. It almost looks like some kind of acid is doing this. I had no definitive answers for the customer, but insisted they were not from our machines due to the location of the marks. The problem is pretty bad. I looked around and noticed about 40 driveways that are also rotting away.

Anyone know what this is? Bad pave job (its less than 3 years old)? Acid rain? Bad snow removal company (we don't do snow)? Ever been accused of something like this?

[93Chevy]

Hmm...I don't have an answer, but I know what you're referring to.

I'd like to sit around for an explanation as well.

On a different not, not trying to thread jack, but where in Pitt are you?

[Bulldog22]

I'd bet money she's complaining about fertilizer. Some with iron in it will rust and leave spots on the ground, it really shows up on gray concrete.

[topsites]

Does this help:

http://www.askmehelpdesk.com/constru...rt-184164.html

Somewhere in all of that they speak of taking core samples?

[P.Services]

is the rust spot always starting at a little brown colored soft stone in the asphalt? its just the agg they use every drive around here has it. not from mowers not from fert. the only way to stop that is to seal coat it .

[44DCNF]

That is what I was thinking it sounded like, either soft aggragate that eroded away, stones high in iron, or stones popped out from freeze/thaw.

[WizBang]

Originally Posted by Bulldog22

I'd bet money she's complaining about fertilizer. Some with iron in it will rust and leave spots on the ground, it really shows up on gray concrete.

The owner of the company I work for checked it out and it's definately a bad pave job. The old lady who complained said she witnessed our stander mowers do it last week. Insisted it was leaking oil...haha.