Cob: stucco question?

[Charmaine R Taylor]

Mike said:When working with a lime mortar in foundations and stone
plinths
they traditionally used an hydraulic lime mortar either by
1. adding a pozzolan to a lime putty/sand mix to set off some part
of the mix prior to carbonation.
    ( a pozzolan is a burnt clay such as volcanic ash, brick dust,
crushed
clay tiles etc which reacts with the lime to     form cementitious
compounds)
2. using a natural hydraulic lime mixed with sand.
Permanently damp stone structures don't allow sufficient air and
hence
carbon dioxide into the mortar matrix to carbonate the lime to the
extent
needed.

Mike, as a matter of course would you recommend hydraulic hydrated lime
for all base stone work (foundations, etc?)  or is is priudent for owner
builders of stone bases mix their own clay-ash pozzolans into reg lime?

Charmaine  Taylor/ Taylor Publishing
http://www.dirtcheapbuilder.com