Browsing by Issue Date, starting with "2021-10-25"
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- Fractal reconstruction of fiber-reinforced epoxy microstructurePublication . Radovic, Ivona; Stajčić, A.; Mitić, V. V.; Serpa, Cristina; Paunović, V.; Randelović, B.In the past century, the use of polymers and composites with a polymer matrix has expanded to such a level that today it is impossible to imagine life without these materials. Epoxy resin and epoxy-based composites are widely used as construction materials, due to their excellent adhesion, thermal and chemical stability. Fractal nature analysis can provide insight in morphological changes at fiber-matrix interface level, which could give direction for the processing of composites. This mathematical technique can be performed on field emission scanning electron microscopy (FESEM) images, by identifying fiber phase and pores shapes and boundaries, as well as fiber-matrix bonding at the interface. In this study, fiberglass mat was used for the reinforcement of epoxy. FESEM image of enlarged fiber after the composite fracture was used for the reconstruction of data. With the use of affine fractal regression model, software Fractal Real Finder was employed for the reconstruction of fiber shape and the determination of Hausdorff dimension.
- Valei-me Deus, eu ardo!Publication . Dassie, Luciana Gomes Silva; Rosa, Armando Nascimento"Valha-me Deus, eu ardo!" é o exercício de escrita de uma peça de teatro que configura uma experimentação de escritura dramatúrgica utilizando elementos da estrutura de desfiles de escolas de samba brasileiras. O processo investiga de que maneira essa estrutura dos desfiles rompe com preceitos da poética aristotélica, tendo como base a leitura da poética do Teatro do Oprimido de Augusto Boal, com ênfase no estudo do Sistema Coringa.
- Durability of an UHPC containing spent equilibrium catalystPublication . Matos, Ana Mafalda; Nunes, Sandra; Costa, Carla; Aguiar, JoséUHPC is an advanced cementitious material able to meet the current construction industry challenges regarding structural safety and durability. However, new UHPC formulations with limited shrinkage are still being pursued to reduce residual tensile stresses in the UHPFRC layers, for rehabilitation/strengthening applications. This investigation estimates the durability of a non-proprietary UHPC incorporating a by-product originated by the oil refinery industry (ECat), as an internal curing agent. Direct and indirect transport properties measurements as well as the carbonation assessment and evaluation of dimensional resilience to potential deleterious reactions revealed that the new UHPC possesses an excellent durability performance, typical of these materials. These results combined with its self-compacting ability, low autogenous shrinkage and high compressive strength confirm the belief in the role of this new UHPC towards a high-tech construction.