ANÁLISE EXPERIMENTAL DA EVOLUÇÃO DA CARBONATAÇÃO EM ARGAMASSAS DE CAL AÉREA
Palavras-chave:
Aerial lime, Carbonation, Thermogravimetric analysis, Preservation, RestorationResumo
For centuries, aerial lime has been frequently used as binder for preparing mortar in masonry buildings. Knowledge about the material behavior of aerial lime mortars is however still reduced, and contributions are necessary for better understanding its physical and mechanical properties, in this work, an experimental program is done to investigate the evolution of carbonation process. It starts with the definition of mortar composition, a typical composition is adopted. Specimens with reduced thickness were stored in three different chambers. The first chamber presents ordinary environmental conditions, while the other two environments present elevated humidity or CO2 concentration. Thermogravimetric analysis was done at five ages, and the results indicate a progressive increase of the carbonation, however, an incomplete carbonation process was observed, therefore a normalization was adopted. The data show a faster carbonation process for the specimen stored in the chamber with elevated CO2 and a reduced evolution of mortar stored in the humid chamber at the first ages.
Referências
CEN (2005). "CEN-EN-196-1-Methods of testing cement. Determination of strength."European Committee for Standardization.
Dheilly, R. M., J. Tudo, et al. Influence of storage conditions on the carbonation ofpowdered Ca(OH)2. Construction and Building Materials 16(3), 2002. p. 155-161.
Houst, Y. F. The role of moisture in the carbonation of cementitious materials.
International Journal for Restoration of Buildings Monuments 2(1), 1996. p. 49 66.
Lawrence, R. M. H. A Study of Carbonation in Non-Hydraulic Lime Mortars.
Department of Architecture and Civil Engineering. Bath, University of Bath. Doctor ofPhilosophy, 2006. 316 p.
Margalha, G., Veiga, R., Silva, A. S. and de Brito, J., (2011). "Traditional methods ofmortar preparation: The hot lime mix method." Cement and Concrete Composites,33 (8), 796-804.
Montes-Hernandez, G., R. Chiriac, et al. Gas solid carbonation of Ca(OH)2 and CaOparticles under non-isothermal and isothermal conditions by using athermogravimetric analyzer: Implications for CO2 capture. International Journal ofGreenhouse Gas Control 11, 2012. p. 172-180.
Montes-Hernandez, G., D. Daval, et al. Growth of Nanosized Calcite through. CrystalGrowth & Design 10(11), 2010. p. 4823-4830.
Montes-Hernandez, G., A. Pommerol, et al. In situ kinetic measurements of gas solidcarbonation of Ca(OH)2 by using an infrared microscope coupled to a reaction cell.
Chemical Engineering Journal 161(1 2), 2010. p. 250-256.
Moropoulou, A., et al. (1996). "Hot lime technology imparting high strength to historicmortars." Construction and Building Materials, 10 (2), 151-159.
Oliveira, M. A., (2015). "A Multi Physics Approach Applied to Masonry Structures withNon Hydraulic Lime Mortars." Tese de Doutorado, Universidade do Minho.
OLIVEIRA, M. A. et al. Study of the evolution of carbonation in aerial lime mortars, VFical - FICAL FORUM IBÉRICO DA CAL. Lisbon: 10 p. 2016.
OLIVEIRA, M. A. et al. Experimental analysis of the carbonation and humiditydiffusion processes in aerial lime mortar. Construction and Building Materials, v. 148,p. 38-48, 2017. ISSN 0950-0618.
Sanjuán, M. A., C. Andrade, et al. Concrete carbonation tests in natural andaccelerated conditions. Advances in Cement Research 14(5), 2003. p. 171 180.
