English version
N.º 10
2009
pp. 41-53

 

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Artigo
Interpretação da química e da tecnologia de ligantes à base de cal e sua implementação no campo da conservação

Georgia Zacharopoulou

Ephorate of Modern Monuments of Central Macedonia, Greek Ministry of Culture Mouson 89, 54634 Thessaloniki, Greece

gzachar.heritage@gmail.com

Resumo

O objectivo do presente artigo é a compilação, revisão e disseminação do actual conhecimento científico sobre teoria e tecnologia da cal no campo da conservação do património. Com base na investigação da última década, são destacados os fortes indícios do efeito positivo - não demonstrável por equação química - do elo perdido 'chave', o processo de maturação. É demonstrado que as excepcionais características de desempenho das argamassas à base de cal mais duráveis dependem predominantemente das suas capacidades para uma rápida, eficiente e extensa carbonatação da fase de presa aérea da cal, em particular quando é usada cal em pasta com maior tempo de maturação (extinção húmida ao nível das nanopartículas); e da estabilidade química e mecânica dos com-ponentes de resistência (principalmente silicatos de cálcio hidratados (CSHs)) da fase hidráulica da cal, que é mais elevada nas for-mas mais cristalinas das misturas históricas de cal e pozolana do que nas formas amorfas dos cimentos modernos. Deste modo são asseguradas as ligações fisico-químicas por adesão e por coesão, quer na matriz de cal, quer nas interfaces ligante/agregado, conferindo minimização de fissuras e durabilidade a argamassas à base de cal e alvenarias históricas. Uma abrangente documentação destes processos permitirá a obtenção de materiais e procedimentos progressivamente mais adequados à preservação do nosso património cultural.

Palavras-chave

Maturação
Cal em pasta
Argamassa de cal
Componentes de resistência
Estabilidade estrutural

Idioma

Inglês

Título original

Interpreting chemistry and technology of lime binders and implementing it in the conservation field

DOI

10.14568/cp10-4

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Conservar Património | APA | Chicago | NP405 | ABNT

Conservar Património:
Zacharopoulou, G., 'Interpreting chemistry and technology of lime binders and implementing it in the conservation field', Conservar Património 10 (2009) 41-53, https://doi.org/10.14568/cp10-4.

APA:
Zacharopoulou, G. (2009). Interpreting chemistry and technology of lime binders and implementing it in the conservation field. Conservar Património, 10 41-53. DOI:10.14568/cp10-4.

Chicago:
Zacharopoulou, Georgia. 2009. "Interpreting chemistry and technology of lime binders and implementing it in the conservation field." Conservar Património 10:41-53. doi:10.14568/cp10-4.

NP405:
ZACHAROPOULOU, Georgia – Interpreting chemistry and technology of lime binders and implementing it in the conservation field. Conservar Património. ISSN 1646043X. 10 (2009) 41-53.

ABNT:
ZACHAROPOULOU, Georgia. Interpreting chemistry and technology of lime binders and implementing it in the conservation field. Conservar Património, Lisboa, v. 10, p. 41-53, 2009. Disponível em: <https://doi.org/10.14568/cp10-4>. Acesso em: .

História

Recebido: 2010-02-04
Revisto: 2010-01-29
Aceite: 2009-10-30Online: 2017-10-3
Publicação: 2010-7-5

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Endereço persistente: https://doi.org/10.14568/cp10-4


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