Mapeamento De Deteriorações Em Monumentos Históricos De Pedra-Sabão Em Ouro Preto

Silva, Maria Elizabeth da; Roeser, Hubert Mathias Peter

doi:10.25249/0375-7536.2003334329336

Cited by 13 publications

(17 citation statements)

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“…As modificações nas rochas e outros materiais utilizados caracterizam, sob a ótica da conservação, o grau de degradação da obra. A caracterização do estado de conservação de uma obra arquitetônica é realizada através da fotodocumentação, do mapeamento litológi-co e do mapeamento detalhado das formas de intemperismo (Silva & Roeser, 2003).…”

Section: Principais Patologias Diagnostica-das E Seus Efeitosunclassified

Análise e avaliação da deterioração do revestimento de mármore da cúpula da Catedral Metropolitana de Porto Alegre, RS

Philipp

Benedetti

2007

RBG

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Resumo A Catedral Metropolitana de Porto Alegre -RS, projetada em estilo neo-renascentista pelo arquiteto romano João Batista Giovenalle, teve seu período construtivo compreendido entre 1921 e 1986. O corpo externo da igreja foi edificado em granito equigranular róseo proveniente da área urbana de Porto Alegre. Já a sua imponente cúpula apresenta como revestimento placas de mármore dolomítico silicoso proveniente do Estado do Espírito Santo. Originalmente, o revestimento especificado pelo autor do projeto para este elemento arquitetônico era o cobre, porém por motivos de ordem financeira o revestimento foi substituído pelo mármore. Contudo, não foram realizadas as adequações projetuais necessárias para o perfeito funcionamento do revestimento escolhido, resultando assim numa série de patologias que acabaram por comprometer não só a estética do revestimento bem como sua integridade física. Os problemas estruturais e materiais identificados na cúpula foram resultado da atuação dos processos intempéricos, resultando na deterioração e degradação da obra.Palavras-chave: patrimônio cultural, rochas ornamentais, intemperismo, técnicas de conservação, educação. Abstract Analysis and evaluation of deterioration of the marble cover of the cupola of the Metropolitan Cathedral of Porto Alegre, RS. The Metropolitan Cathedral of Porto Alegre, in Rio Grande doSul state, was designed by roman architect João Batista Giovenalle. This construction was developed in a long time between 1921 and 1986. The external building design has a match of granite and marble. In the body of the church was used rose equigranular granite extracted from a quarry located in Porto Alegre. Its imposing dome has covering of siliceous dolomitic marble drew out from quarry of Espírito Santo state. Originally the author of the project planned to recover this architectural element with copper, but this material was replaced by marble due to financial difficulties. However it wasn't planned the necessary suitableness structures to perfect operation of this new material and resulted in a series of pathologies that damaged its aesthetic satisfactory design and the own building. The structural and materials problems identified in external dome resulted of degradations mechanisms related to physical, chemical and biologic weathering.

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Section: Principais Patologias Diagnostica-das E Seus Efeitosunclassified

Análise e avaliação da deterioração do revestimento de mármore da cúpula da Catedral Metropolitana de Porto Alegre, RS

Philipp

Benedetti

2007

RBG

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“…When weathered they are brownish due to iron oxides and hydroxides and contain macroscopic pores and cavities resulting from leaching porphyroblasts, carbonates and sulphides. One can observe the existence of millimetric to centimetric cracks [1]. What favours the use of this rock in heritage works is its easy handling and parts with detail finishing.…”

Section: Introductionmentioning

confidence: 99%

“…The historical buildings of the Baroque period in the cities of Ouro Preto, Mariana and Congonhas do Campo in Minas Gerais are numerous. They are part of the Cinturão de Rochas Verdes (Rio das Velhas) [1]. A steatite is considered to be a solid rock, consisting mainly of the mineral named talc [2,3], Mg 3 Si 4 O 10 (OH) 2 .…”

Section: Introductionmentioning

confidence: 99%

Criteria of waxes’ performance in the consolidation of steatites (soapstone) in heritage buildings

Guia¹,

Motta²

2015

WIT Transactions on the Built Environment

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The present work investigates the use of consolidants in stone material of integrated built heritage undergoing the action of some acids derived from pollutant air gases on the steatites (soapstone) of architectural works as well as the description of the correlated chemical reactions. It is proposed to examine these atmospheric pollutants, highlighting the SO 2 and NO 2 gases and their respective acids. If these gases from fossil fuel burning act decisively in the stone material and one can slow down and/or prevent degradation through the use of consolidant chemicals with certain characteristics by means of technical standards, e.g. the quality of the consolidation, depth of penetration, porosity, consolidating compatibility with rock, final appearance and safety during application. Initially, the basic characteristics and chemical composition of the stone material were studied as well as its occurrence in equity work properties. This research addresses the consolidation of steatites (soapstone) by the use of wax for the control of degradation in stone material heritage.

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“…Steatite has been widely employed in the carving of elements in facades of Brazilian historical buildings and baroque churches since the 17 th century. Those buildings are now part of the world heritage 3 . Over the years, many of those historical buildings suffered the consequences of weathering with a current need for restoration or complete replacement of some steatite elements.…”

Section: Introductionmentioning

confidence: 99%

“…Over the years, many of those historical buildings suffered the consequences of weathering with a current need for restoration or complete replacement of some steatite elements. In addition, other wear mechanisms take place on the stone surface such as degradation and deterioration which are related not only to natural factors, but also human actions 3 . The degradation is an alteration of the material surface that always assumes degeneration of its characteristics according to a conservative perspective.…”

Section: Introductionmentioning

confidence: 99%

Cement - steatite composites reinforced with carbon fibres: an alternative for restoration of brazilian historical buildings

et al. 2011

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Steatite is a mineral which has been employed in the carving of elements in facades of Brazilian historical buildings and churches since the 17 th century. Over the years, many of those historical buildings suffered the consequences of weathering with a current need for restoration. Recently a special cement-based mortar containing additions of fine powder waste from mineral extraction of steatite has been developed in Brazil, as a composite material for restoration of steatite elements. However, the incorporation of steatite waste reduces the flexural strength of the mortar and compromises the restoration of elements where gravity imposes tensile stresses. The addition of carbon fibres may overcome this issue and increase the flexural strength of the cement-steatite composite mortar. This work investigates the effect of carbon fibre addition on the bulk density and flexural strength of compacted precast cement-steatite composites. The results show that the addition of carbon fibres (i) effectively increases the mechanical strength, allowing for a higher amount of steatite powder waste in the mixes; (ii) reduces the weight of the structural elements. This new composite material would help to develop restoration techniques of historical buildings and serve as a disposal route of steatite powder waste in Brazil.

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Mapeamento De Deteriorações Em Monumentos Históricos De Pedra-Sabão Em Ouro Preto

Cited by 13 publications

References 0 publications

Análise e avaliação da deterioração do revestimento de mármore da cúpula da Catedral Metropolitana de Porto Alegre, RS

Análise e avaliação da deterioração do revestimento de mármore da cúpula da Catedral Metropolitana de Porto Alegre, RS

Criteria of waxes’ performance in the consolidation of steatites (soapstone) in heritage buildings

Cement - steatite composites reinforced with carbon fibres: an alternative for restoration of brazilian historical buildings

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