Improvement of a lime-based mortar's thermal properties using alkaline activation

• Autor(a) principal: Matos, Fábio André Cancelas
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/25827
• topic: Alkali activation; Ordinary portland cement; Aluminosilicate; Alkali hydroxide

This dissertation was developed as proposed by company Domínio Do Ligante – Argamassas Tradicionais Pré-doseadas Lda. In cooperation with the Department of Geoscience of University of Aveiro, granting the author the conclusion of the second cycle of studies in Geomaterials and Geological Resources by the aforementioned institution. The main goal of this study is to improve the thermal insulation properties, mainly thermal conductivity, of lime-based mortar ‘DDL.ECM Projeção’ through alkali activation instead of traditional hydration. As a secondary objective, the study intends to evaluate the technical viability of the product of the experiment in respect to its mechanical properties, capillary absorption and response to acid dissolution. To fulfill these goals, four laboratory trials took place. In each trial, a control group and two test groups were prepared by mixing the mortar with aqueous solutions of sodium hydroxide and potassium hydroxide, respectively, at a concentration of 3 molar, with the control group being hydrated with water only. The mixtures are then cast in molds and left to cure until demolding. After this, the specimens are to be teste according to the parameters of the study. The four experimental procedure trials were incapable of producing a sufficient number of viable specimens for testing given their fragility and inconsistency. These results rend impossible de measuring of the properties at study in order to resolve the problem question, as such, the main goal of the dissertation is inconclusive. The secondary goal, however, is achieved, affirming the technical unviability of alkali activation of DDL.ECM Projeção by the methods employed in this procedure. It is concluded that the CaO content in the mortar is inadequate for this type of process when compared to the inferior content of either SiO2 and Al2O3; not allowing the formation of a stable hybrid system