Desempenho de argamassas produzidas com Escória Granulada de alto-forno moída e coproduto do processo de Dessulfurização de Gases de Combustão (FGD) em substituição ao cimento Portland

• Autor(a) principal: Morelo, Luciana Paula Tessaro
• Data de Publicação: 2023
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/17017
• topic: Engenharia Civil; Dessulfurização de Gases de Combustão (FGD); Escória Granulada de alto-forno moída; Resistência à compressão; Argamassa com baixo teor de cimento; Argamassas com incorporação de resíduos; subject.br-rjbn

Alternatives have been studied in order to minimize the major environmental impacts arising from the production of cement and steel. Even adopting composite cements, with the incorporation of alternative materials, reducing the need for cement in the mixtures. Therefore, this work studied the viability of incorporating steel residues in the mechanical performance of mortar durability, evaluating the partial and total replacement of Portland Cement (PC) by granulated blast furnace slag (EGAF) and residue from the Desulfurization process of flue gases (FGD). This research evaluated the mechanical and durability performances of mortars produced replacing cement with EGAF (0%, 60% and 70%) and FGD (0%, 10%, 25% and 30%), using a water/binder ratio of 0.60. In the fresh state, consistency index, mass density, incorporated air content, water retention and setting times were determined. In the hardened state, the Compressive Strength, Tensile Strength by Diametral Compression, Water Absorption by capillarity, Content of total chlorides and soluble sulfates, in addition to the microstructure of the mortars and the leaching of contaminants, were evaluated. ANOVA of the results obtained was performed. The studied mixes showed a higher mass density and, consequently, a lower amount of air incorporated in the mixtures. The results found show that the association of these residues in place of cement improved the mechanical performance of the mortars. With regard to compressive and tensile strength, the mortars E60F10 and E70F10 obtained the best performances, with increases greater than 40%. The mix with 0% cement, E70F30, obtained superior resistances to the reference mix at 28 days. As for the dynamic modulus of elasticity, all mixes containing substitution obtained values lower than the reference, with the exception of the E60F10 mix, which obtained a modulus of 32 GPa. The E00F30 mix showed a reduction of more than 16% in the modulus, which points to a mix with greater capacity to absorb deformations. As for water absorption by capillarity, all the traits had lower water absorption than the reference trait, with the exception of the E00F30 trait. The EGAF-containing mixes significantly increased the performance against this property, since the mixes had 80% lower rates of water absorption than the reference. In addition, all samples showed excellent performance against the tests of total chlorides and sulfates. The contaminant leaching test did not show any contaminants in harmful amounts. The results show that the simultaneous use of FGD and EGAF to replace Portland cement is extremely satisfactory, obtaining mechanical and durability performances superior to the reference ones, enabling the use of these residues for the production of mortars with low cement content.