Conservation of Historic Renders and Plasters: From Laboratory to Site

摘要: In interventions on historic renders and plasters, the first step is to decide upon strategy: repair or substitution, based an evaluation of cultural value render plaster, building itself a careful diagnosis typology defects, their quantity reparability. New repaired should fulfil main functions they are required to, especially protection aesthetic functions. Compatible materials always be used. Compatibility needed for durability, not render, but wall as whole, also preserving documentary symbolic well its image. defined in relation substrate existing mortars. Therefore tests need carried out old possible solutions, compare characteristics assist selection best. It acceptable begin using non-destructive slightly destructive in-situ tests, because with them it collect useful information quickly without destruction renders. Simple mechanical physical can mortars few chemical performed, portable equipment. If rigorous complete needed, some samples collected tested laboratory, methods adapted non-regular, possibly friable specimens. The use established, results obtained, order both functionality compatibility. However, sometimes obtain enough data about materials, concerning masonry which more difficult test than For this situation, general requirements have been previous work Portuguese buildings, used risk damaging materials. Decisions use, binder take into account climatic environmental conditions. Appropriate application techniques, workmanship curing conditions indispensable achieving good aesthetic, results. important know what available phase. An effective knowledge compatible problems, essential; tool interpretation decisions complex task, requiring multidisciplinary team efficiently coordinated.