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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Comparative study of technological parameters of characterization in stones and coatings and non resined resined. / Estudo comparativo dos parÃmetros de caracterizaÃÃo tecnolÃgica em rochas ornamentais e de revestimentos resinadas e nÃo resinadas.

Fernando Antonio Castelo Branco Sales 19 December 2012 (has links)
For intermediate analysis and technological characterization tests conducted on samples of resinated and non-resinated rocks with distinct structural and geological characteristics, we sought to verify the effectiveness of the resin with respect to physical and mechanical resistance of these rocks, as well as evaluating the reduction of agents that produce the same changes and pathology. The investigation of this research has focused on three types of rocks: the first refers to a commercially called White granite Blizzard, which is an isotropic rock with some degree of fracture, equigranular texture and average grain size of the fine and the second was represented petrographically for a garnet-biotite-musvovita roughly gnaissificado, commercially known as Casa Blanca, having a coarse-grained, with lineations and foliations with a high presence of micaceous minerals, and the third is a volcanic rock, trade name Wood Stone, material considered exotic because of their textural heterogeneity, with a high degree of fissuring, having very fine grain. After the results of tests and analysis, they were correlated and evaluated the effectiveness of the resin, being featured in that it produces significant improvements in physical and mechanical resistance of these rocks, especially regarding the levels of porosity and water absorption, which are the gateway of the causative agents of change and generations of pathologies in ornamental and coating. Research has shown that materials with restricted use, or even inappropriate to certain environments, due to its physical and mechanical resistance, using the resin, the same could be used without restrictions. The importance of testing materials whose marketing is made using resin was evident due to changes often significant parameters of the results of characterization of technology, which serve as reference in the specification suitable for use as coating materials or ornamental, the construction works.The apparent porosity and water absorption were reduced by 9, 7% and 91.46% respectively after the material is resin. / Por intermÃdio de anÃlises e ensaios de caracterizaÃÃo tecnolÃgica realizados em amostras resinadas e nÃo resinadas de rochas ornamentais, com caracterÃsticas geolÃgicas e estruturais distintas, buscou-se verificar a eficÃcia da resina no tocante a resistÃncia fÃsica e mecÃnica dessas rochas, bem como avaliar a reduÃÃo dos efeitos dos agentes que produzem alteraÃÃes e patologias nas mesmas, e na exalaÃÃo do gÃs radÃnio. A investigaÃÃo desta pesquisa foi focada em trÃs tipos de rochas: a primeira representada por um granito comercialmente denominado Branco Nevasca, que constitui uma rocha isotrÃpica com pouco grau de fraturamento, textura equigranular e granulaÃÃo de mÃdia a fina; a segunda um granada-biotita-musvovita grosseiramente gnaissificado, granulaÃÃo grosseira,apresentando lineaÃÃes e foliaÃÃes com elevada presenÃa de minerais micÃceos, denominado Casa Blanca; e, a terceira uma rocha vulcÃnica, com nome comercial Wood Stone, material considerado exÃtico em funÃÃo de sua heterogeneidade textural, com alto grau de fissuramento, possuindo granulaÃÃo muito fina. ApÃs os resultados dos ensaios e anÃlise, os mesmos foram correlacionados e avaliada a eficÃcia da resina, sendo constatado que a mesma produz melhoras significativas na resistÃncia fÃsica e mecÃnica dessas rochas, especialmente no tocante aos Ãndices de porosidade e de absorÃÃo dâÃgua, que sÃo a porta de entrada dos agentes causadores de alteraÃÃes e geraÃÃes de patologias, nas rochas ornamentais e de revestimento. TambÃm demonstrou eficiÃncia na reduÃÃo da exalaÃÃo do gÃs radÃnio A pesquisa mostrou que materiais com uso restrito, ou mesmo inadequado a certos ambientes, em funÃÃo de sua resistÃncia fÃsica e mecÃnica, com o uso da resina os mesmos poderiam ser utilizados sem restriÃÃes. A importÃncia de se realizar ensaios nos materiais cuja comercializaÃÃo à feita com uso de resina, ficou evidenciada devido Ãs alteraÃÃes, muitas vezes significativas, nos parÃmetros dos resultados de caracterizaÃÃo tecnolÃgica, os quais servem de referÃncia na especificaÃÃo adequada de uso dos materiais utilizados como revestimento ou ornamental nas obras de construÃÃo civil. A porosidade aparente e a absorÃÃo dâÃgua foram reduzidas em 90,7% e 91,46%, respectivamente, apÃs os materiais serem resinados.

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