Abstract
Lime and the lime mortars and plasters made from it have a long and successful history in building construction. However, the development of Portland cement in the 19th century gradually displaced or supplemented lime and much of the ancient trades knowledge has been lost, often to the detriment of masonry construction and conservation. The author has been associated with the conservation of many of Australia’s oldest masonry buildings and structures and, backed by research at the University of Newcastle, has been able to show that the best and most durable of the old mortars were accidentally or deliberately made with impurities which gave hydraulic properties and proportioning which aided carbonation. The ability to replicate the successful mortars and match mortar to the brick or stone now seems possible.
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