On Mon, 19 Mar 2007 19:09:40 -0400, Mark K wrote:


I had big divots in the concrete at one house in Colorado, but very
little effect on a second house in the same town. The sidewalk at the
second house was only a few years old, while the first house had a
30-year-old sidewalk, so age may have played a part.

Are you saying the 30-year old driveway was good until you used salt
on it?

And that caused divots?

I'd been led to believe that after a year or two it was safe to use
salt.

(and I used a little this year for the first time in 28 years.)

The composition of the sidewalks was different. The older sidewalk had
visible gravel in the concrete, while the newer one did not.

Mark