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MÜLLER, Urs; KANAN, Maria. The micro structure of traditional brazilian lime plasters – the custom house of Florianopolis. In: SIMPÓSIO BRASILEIRO DE TECNOLOGIA DAS ARGAMASSAS, 6., 2005, Florianópolis. Anais... Florianópolis: UFSC, 2005. p. 1 - 10.
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Número de Trabalhos: 1 (Nenhum com arquivo PDF disponível)
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Dados do autor na base InfoHab:
Número de Trabalhos: 1 (Nenhum com arquivo PDF disponível)
Citações: Nenhuma citação encontrada
Índice h: Indice h não calculado  
Co-autores: 1

Abstract

 The Custom House in Florianopolis on Santa Catarina Island is a neo classic building from 1876, originally situated close to the sea. In the course of its history the building and its surrounding area underwent extensive modifications altering its physical condition and changing its local environment. As a consequence problems with deterioration grew more serious by increasing the moisture content of the walls due to the uptake of damp from the ground and as a consequence loosing parts of the original plasters and stuccos of the building. In order to characterize the texture of the plasters and to evaluate possible damage mechanisms samples have been subjected to micro textural analysis. The samples investigated consisted of several layers beginning with an earthen render followed by a lower (with two sub-layers) and an upper plaster. The upper plaster was covered by a multi-layer paint. Upper and lower plaster consisted of a lime binder with cement as a hydraulic additive. The render was composed of earth with the addition of lime. In all three main layers sea shells could be identified. The micro textural analysis revealed an interesting issue concerning the traditional technique of using lime from burnt sea shells as a binding media. Under the optical microscope and the SEM quartz grains with two outer rims could often be observed. Micro chemical analysis showed that both rims consisted of calcium silicates. However, the outer rim exhibited a higher Si/Ca ratio, pointing to a calcium silicate hydrate phase. The observed texture indicated that quartz grains, which were burnt together with the sea shells, reacted with CaO to a calcium silicate. Therefore the reaction between quartz grains and calcium oxide seems to be a good explanation for the sometimes reported hydraulic properties of such lime products. It is also an interesting discovery for the understanding of the history of lime making techniques in the Island of Santa Catarina in conjunction with the use of Portland cement as an addition.
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