M.L. THOMSON AND S.J. BASTEN
The durability of mortar is dependent on its physical properties, as well as the environment to which it is exposed. Mortars taken from stone structures in Arctic Canada and inland Ireland, dating from the mid 1500’s, are examined using petrographic and scanning electron microscopy, mercury porosimetry, and thermal gravimetric analysis. Their apparent durability is probably more dependent on their location, rather than their inherent properties.