Grumps wrote:
Hi All

I read an article saying that copper will resist corrosion if laid in a
portland based concrete or mortar. Could someone explain why, and what is
the alternative to portland that WOULD corrode copper? (Sorry, my knowledge
of chemistry never was a strong point).

Err, it won't really resist.
In fact, it should never, ever be laid bare into concrete, and should
always be covered by something, be it the appropriate tape, or whatever.