On Sat, 12 Apr 2008 16:59:12 -0700 (PDT), Scott
wrote:

Any folks out there with concrete experience?

I've got a problem with my front porch.
There's a spot that looks like it's deteriorating.
My questions a
1. Have you seen this condition before?
2. What's causing it?
3. What do I need to do to fix it?

Pictures located he http://www.19-60.org/pics/porch.html

Thank you!

Scott

Looking at your feet (g), it appears to me that this is calcium
deposits from hard water. The landscape rocks seems too suggest you
are in an arid climate. Is there an irrigation system near the cement?

Nothing to be alarmed about. Try a vinegar spray, allow to set and
repeat the process (pour it on full strenght, sit for awhile and
rinse).

We get this on block walls and pads. I think it's called Efflorescence
(?) You won't get it cleaned up, untill the water/ moisture is
stopped.

http://en.wikipedia.org/wiki/Efflorescence