On 28/11/2017 20:45, Jim GM4DHJ ... wrote:
Having seen loads of imperial brick buildings fall down that were built 1890
to about 1910 way does everybody go on about how wonderful lime mortar is
......?

The Ca(OH)2 turns into CaCO3 eventually by absorbing CO2 from the
atmosphere, which is a lot stronger.

--
Max Demian