Publicação
Experimental analysis of carbonation, humidity fields and the evolution of elastic modulus in air lime mortar
| Resumo: | Air lime is a binder that was frequently adopted for preparing mortar in ancient masonry structures; however, knowledge about it is still scarce. An integrated experimental program was employed to perform different tests using a single geometry: humidity fields (drying process), carbonation, and the evolution of stiffness (elastic modulus). The drying process was continuously monitored over time; the specimens were stored in a climatic chamber with fixed humidity (60%), and equilibrium was obtained around 14 days. Carbonation data obtained through thermogravimetric analyses and phenolphthalein tests lent themselves to a formula that allowed quantifying the degree of carbonation (~35–60%). Mechanical tests were done to assess the evolution of the elastic modulus in two different environments with relative humidity of 60% and 90%. The results obtained for the elastic modulus were six to three times higher in the specimens stored in the climatic chamber with lower humidity. Finally, an integrated analysis is presented, analyzing the coupling of the different fields. The drying process is primarily responsible for the initial stiffness, and subsequently, the progress of the carbonation process increases the elastic modulus. |
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| Autores principais: | Oliveira, Mateus A. |
| Outros Autores: | Azenha, Miguel; Lourenço, Paulo B.; Meneghini, Anna; Guimarães, Erika T.; Castro, Fernando; Soares, Delfim; Ramesh, Meera |
| Assunto: | Air lime Mortar Carbonation Thermogravimetric analysis Phenolphthalein test Humidity flux Elastic modulus |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Air lime is a binder that was frequently adopted for preparing mortar in ancient masonry structures; however, knowledge about it is still scarce. An integrated experimental program was employed to perform different tests using a single geometry: humidity fields (drying process), carbonation, and the evolution of stiffness (elastic modulus). The drying process was continuously monitored over time; the specimens were stored in a climatic chamber with fixed humidity (60%), and equilibrium was obtained around 14 days. Carbonation data obtained through thermogravimetric analyses and phenolphthalein tests lent themselves to a formula that allowed quantifying the degree of carbonation (~35–60%). Mechanical tests were done to assess the evolution of the elastic modulus in two different environments with relative humidity of 60% and 90%. The results obtained for the elastic modulus were six to three times higher in the specimens stored in the climatic chamber with lower humidity. Finally, an integrated analysis is presented, analyzing the coupling of the different fields. The drying process is primarily responsible for the initial stiffness, and subsequently, the progress of the carbonation process increases the elastic modulus. |
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