Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)

Detalhes bibliográficos
Autor(a) principal: Antunes, Alexandra de Carvalho
Data de Publicação: 2011
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/47385
Resumo: The ‘Cais das Colunas’ is located on the border of Tagus River, integrating the ‘Terreiro do Paço’ the royal square of the historical centre of Lisbon and the ‘Baixa Pombalina’. The quay, erected after the great Lisbon earthquake of 1755, is a historical place and tourist mark of the Portuguese capital. Due to the expansion of the underground lines of the city of Lisbon, the coastal monument was partially removed in 1997, in order to construct a tunnel beside its foundations. The deconstruction, or partial removal, took four months, in the Spring/Summer of 1997. During the deconstruction, each one of the 1500 limestone blocks was carefully removed, marked with a number and then transported to a safe place. Later, it was applied urgent cleaning treatments on part of the limestone blocks. The reconstruction project was initially planned to be completed in 1999, but accidents, during the construction of the new underground line, resulted in its postponement. During the summer of 2008 the historic quay was finally reconstructed. The monument was reconstructed using modern techniques and materials. Structural corrections were made but each of the stone blocks was replaced in its original localization. Before the removal of the blocks, the main pathologies were identified, classified and mapped. Through macroscopic observation, 17 distinct pathologies affecting stone, mortar or metallic elements were identified and classified. From these, the most significant, in terms of occurrence, were mapped grouping the pathologies in four maps. Results demonstrate that the marine environment is responsible for most of the pathologies. East and west elevations reveal a different distribution of weathering forms, showing wind and solar radiation effects. Of particular relevance are the river polluted water and the biological attacks, as well as effects of air pollutants. Since the quay’s reconstruction, which ended in August 2008, three years have passed. It is now time to evaluate the new materials and construction systems used on the XXIth century (re)construction. Do they contribute to increase the “durability” of the limestone quay? Or will they accelerate its degradation? Is Cais das Colunas a monument at risk? A “preventive conservation program” is being prepared. This includes systematic evaluation and monitoring procedures. The aim is to evaluate the effects of the marine environment on the weathering of the quays’ materials and structure and to clearly identify mechanisms and critical factors, in order to act preventively.
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spelling Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)Cais das ColunasLimestoneLisbonRisk assessmentWeathering formsThe ‘Cais das Colunas’ is located on the border of Tagus River, integrating the ‘Terreiro do Paço’ the royal square of the historical centre of Lisbon and the ‘Baixa Pombalina’. The quay, erected after the great Lisbon earthquake of 1755, is a historical place and tourist mark of the Portuguese capital. Due to the expansion of the underground lines of the city of Lisbon, the coastal monument was partially removed in 1997, in order to construct a tunnel beside its foundations. The deconstruction, or partial removal, took four months, in the Spring/Summer of 1997. During the deconstruction, each one of the 1500 limestone blocks was carefully removed, marked with a number and then transported to a safe place. Later, it was applied urgent cleaning treatments on part of the limestone blocks. The reconstruction project was initially planned to be completed in 1999, but accidents, during the construction of the new underground line, resulted in its postponement. During the summer of 2008 the historic quay was finally reconstructed. The monument was reconstructed using modern techniques and materials. Structural corrections were made but each of the stone blocks was replaced in its original localization. Before the removal of the blocks, the main pathologies were identified, classified and mapped. Through macroscopic observation, 17 distinct pathologies affecting stone, mortar or metallic elements were identified and classified. From these, the most significant, in terms of occurrence, were mapped grouping the pathologies in four maps. Results demonstrate that the marine environment is responsible for most of the pathologies. East and west elevations reveal a different distribution of weathering forms, showing wind and solar radiation effects. Of particular relevance are the river polluted water and the biological attacks, as well as effects of air pollutants. Since the quay’s reconstruction, which ended in August 2008, three years have passed. It is now time to evaluate the new materials and construction systems used on the XXIth century (re)construction. Do they contribute to increase the “durability” of the limestone quay? Or will they accelerate its degradation? Is Cais das Colunas a monument at risk? A “preventive conservation program” is being prepared. This includes systematic evaluation and monitoring procedures. The aim is to evaluate the effects of the marine environment on the weathering of the quays’ materials and structure and to clearly identify mechanisms and critical factors, in order to act preventively.Repositório da Universidade de LisboaAntunes, Alexandra de Carvalho2021-04-13T14:21:44Z20112011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/47385engmetadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T16:49:58Zoai:repositorio.ul.pt:10451/47385Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:59:17.872904Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)
title Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)
spellingShingle Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)
Antunes, Alexandra de Carvalho
Cais das Colunas
Limestone
Lisbon
Risk assessment
Weathering forms
title_short Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)
title_full Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)
title_fullStr Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)
title_full_unstemmed Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)
title_sort Risk Assessment and Preventive Conservation Program of the Limestone Quay Cais das Colunas (Lisbon, Portugal)
author Antunes, Alexandra de Carvalho
author_facet Antunes, Alexandra de Carvalho
author_role author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Antunes, Alexandra de Carvalho
dc.subject.por.fl_str_mv Cais das Colunas
Limestone
Lisbon
Risk assessment
Weathering forms
topic Cais das Colunas
Limestone
Lisbon
Risk assessment
Weathering forms
description The ‘Cais das Colunas’ is located on the border of Tagus River, integrating the ‘Terreiro do Paço’ the royal square of the historical centre of Lisbon and the ‘Baixa Pombalina’. The quay, erected after the great Lisbon earthquake of 1755, is a historical place and tourist mark of the Portuguese capital. Due to the expansion of the underground lines of the city of Lisbon, the coastal monument was partially removed in 1997, in order to construct a tunnel beside its foundations. The deconstruction, or partial removal, took four months, in the Spring/Summer of 1997. During the deconstruction, each one of the 1500 limestone blocks was carefully removed, marked with a number and then transported to a safe place. Later, it was applied urgent cleaning treatments on part of the limestone blocks. The reconstruction project was initially planned to be completed in 1999, but accidents, during the construction of the new underground line, resulted in its postponement. During the summer of 2008 the historic quay was finally reconstructed. The monument was reconstructed using modern techniques and materials. Structural corrections were made but each of the stone blocks was replaced in its original localization. Before the removal of the blocks, the main pathologies were identified, classified and mapped. Through macroscopic observation, 17 distinct pathologies affecting stone, mortar or metallic elements were identified and classified. From these, the most significant, in terms of occurrence, were mapped grouping the pathologies in four maps. Results demonstrate that the marine environment is responsible for most of the pathologies. East and west elevations reveal a different distribution of weathering forms, showing wind and solar radiation effects. Of particular relevance are the river polluted water and the biological attacks, as well as effects of air pollutants. Since the quay’s reconstruction, which ended in August 2008, three years have passed. It is now time to evaluate the new materials and construction systems used on the XXIth century (re)construction. Do they contribute to increase the “durability” of the limestone quay? Or will they accelerate its degradation? Is Cais das Colunas a monument at risk? A “preventive conservation program” is being prepared. This includes systematic evaluation and monitoring procedures. The aim is to evaluate the effects of the marine environment on the weathering of the quays’ materials and structure and to clearly identify mechanisms and critical factors, in order to act preventively.
publishDate 2011
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