PPGEM https://repositorio.ufpb.br/jspui/handle/tede/4458 2026-10-31T14:33:46Z 2026-10-31T14:33:46Z Falcão, Érico Tavares da Silva https://repositorio.ufpb.br/jspui/handle/123456789/39454 2026-10-07T06:11:22Z 2026-01-30T00:00:00Z

Título: Análise da pegada de carbono de energia solar fotovoltaica em Hospital Universitário Autor(es): Falcão, Érico Tavares da Silva Orientador: Carvalho, Monica Abstract: This study performs the computational simulation of a solar photovoltaic system for the Hospital Universitário Lauro Wanderley, located in João Pessoa – PB, quantifies the greenhouse gas (GHG) emissions associated with the system, and calculates the environmental payback and avoided emissions. The system simulation was carried out using the PVsyst software, considering the full use of the hospital’s roof area (13,155 m²). The inventory included photovoltaic modules, inverters, mounting structures, and cabling, based on data from the literature and international standards. For GHG quantification, the Life Cycle Assessment (LCA) methodology was applied using the SimaPro software with the Ecoinvent database and the IPCC 2021 GWP 100a environmental impact assessment method. The designed system presented total emissions of 4,626,541 kg CO₂-eq, with a total energy production of 133,955.783 MWh (30-year lifetime), resulting in an emission factor of 0.035 kg CO₂-eq/kWh and an environmental payback of 6.82 years. When the recycling of steel and aluminum from the structure was included in the LCA (instead of disposal in a sanitary landfill), a reduction of 1,103,947 kg CO₂-eq in GHG emissions was obtained, corresponding to a 29% reduction in the total emissions of the system (from 4,626,541 to 3,305,614 kg CO₂-eq). This improvement also affected the payback period, which, when recalculated, was reduced to 5.19 years. The avoided emissions over the system’s lifetime amount to 20,361,279 kg CO₂-eq for the reference case. The implementation of the solar photovoltaic system significantly contributes to the reduction of the hospital’s GHG emissions, reinforcing the importance of LCA as a decision-support tool in low-carbon energy projects. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2026-01-30T00:00:00Z Faria, André Gustavo Vin Ferreira de https://repositorio.ufpb.br/jspui/handle/123456789/39359 2026-10-01T18:02:13Z 2025-06-30T00:00:00Z

Título: Critérios de eficiência na produção industrial de clínquer para cimento Portland Autor(es): Faria, André Gustavo Vin Ferreira de Orientador: Torres, Sandro Marden Abstract: In today’s highly competitive cement industry, combined with the growing demand for sustainable production practices, enhancing the reactivity of Portland clinker has become a critical objective. This study proposes the industrial implementation of recent scientific and technological advances aimed at maximizing the formation of the alite phase in clinker. Key reactional parameters are evaluated, such as the particle size distribution of reactive silica, the rheological influence of the SO₃ and MgO balance in the liquid phase, and their combined effects on clinker reactivity and overall cement productivity. The study also compiles a set of reactional insights to support a high-performance clinker reactivity model, whose proof of concept demonstrates significant innovative potential for industrial application. In Phase 1, critical reactional triggers for maximizing the alite conversion rate in clinker were validated at an industrial scale. It was shown that SO₃ and MgO act as modulators of the viscosity and surface tension of the liquid phase, favoring the nucleation and growth kinetics of C₃S crystals. Simultaneously, the reduction in reactive silica particle size and the increase in available Ca²⁺ shifted the thermodynamic equilibrium of clinkerization toward the conversion of belite into alite. These transformations resulted in clinker with superior physicochemical properties, evidenced by lower clinker reactivity index (CRI) values, increased grinding productivity, and higher mineralogical coefficient (KM), reflecting greater friability and energy efficiency during comminution. In Phase 2, the reduction of the belite phase (C₂S) was found to be directly correlated with decreased energy consumption during grinding, with measurable gains of up to 3 kWh/t for each percentage point reduction in C₂S content in industrial clinker. Additionally, it was observed that the microstructural reconfiguration of the clinker matrix—including a reduction in belite crystal size and thinner phase boundary zones—significantly improved grinding performance and operational efficiency. This condition was confirmed through optical microscopy, chemical characterization (XRF), reactivity index testing (IRC), and mineralogical coefficient (KM), indicating the consistent formation of high-performance clinkers over the 21- month study period. Both phases converged in the development of a robust technological model for controlling clinker reactivity, grounded in compositional, structural, and operational parameters. This model offers technical support for predicting clinker behavior during the cement phase and provides practical guidelines for real-time process optimization. As a result, value was captured across multiple dimensions: enhanced physical and chemical cemen performance, improved industrial predictability, and significant reductions in variable production costs per ton. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2025-06-30T00:00:00Z Almeida, Ana Natália Fragoso de https://repositorio.ufpb.br/jspui/handle/123456789/38824 2026-09-02T06:11:45Z 2026-03-16T00:00:00Z

Título: Desenvolvimento de metodologia de caracterização e quantificação de materiais policristalinos Autor(es): Almeida, Ana Natália Fragoso de Orientador: Torres, Sandro Marden Abstract: The need for legal expertise in public works has intensified in recent years, making it essential to verify the composition and compliance of the materials used in relation to the technical standards established in tender notices. Among the main materials used in civil construction are clinker, cement, mortar, and concrete, whose proper characterisation is essential to ensure the structural integrity, durability, and performance of buildings. Considering the variability in structural performance according to the proportions of materials used, this study proposes a methodology focused on the technical assessment of materials used in civil engineering, with an emphasis on identifying conformities with the standards established in tender notices, which may compromise safety or constitute irregularities in public works. However, there is a need to develop accessible methodologies that allow for consolidated quantitative assessments of polyphasic material compositions using advanced microstructural characterisation techniques, and which can be used in the conduct of forensic examinations. This methodological integration provides greater accuracy in verifying composition and diagnosing non-conformities, technically supporting the work of Legal Engineering. The approach employed uses a combination of advanced characterisation techniques, such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) applied to the quantification of the crystalline phases of clinker and Portland cement, mortars and concretes. The results obtained demonstrate the applicability of the proposed methodology as a robust and reliable tool for quality control and expert verification of materials used in civil construction. Editor: Universidade Federal da Paraíba Tipo: Tese

2026-03-16T00:00:00Z Silva, Aline Karla Barbosa da https://repositorio.ufpb.br/jspui/handle/123456789/38822 2026-09-02T06:11:40Z 2025-12-15T00:00:00Z

Título: Desenvolvimento de ligas quasicristalinas (AlCuFeCo) a partir de elementos precursores reciclados para uso potencial aplicações em engenharia Autor(es): Silva, Aline Karla Barbosa da Orientador: Lima, Danielle Guedes de Abstract: The development of high-performance quasicrystalline alloys is traditionally associated with the use of high-purity raw materials, leading to increased costs and environmental impact. In this context, this thesis aimed to develop Al–Cu–Fe quasicrystalline alloys doped with Co using recycled precursors, and to evaluate their microstructural, mechanical, surface, and electrochemical performance in comparison with alloys produced from pure elements. Al₆₅Cu₂₂Fe₉Co₄ alloys were fabricated by conventional casting and subjected to heat treatments Characterization was carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), Vickers microhardness, wettability measurements (contact angle in distilled and saline water), and corrosion tests.XRD results confirmed the formation and stability of icosahedral (ψ) and decagonal (D) quasicrystalline phases under all investigated conditions, coexisting with β and β₂ and λ approximant phases. Heat treatment promoted the stabilization of the icosahedral phase in alloys produced from pure elements, while the decagonal phase remained more persistent in recycled alloys. EDS analyses indicated that microstructural evolution occurs through internal chemical redistribution, maintaining compositions within the quasicrystalline stability domain despite the presence of residual impurities. Microhardness measurements showed high and stable hardness values, with only minor variations. Wettability tests revealed consistently high contact angles, indicating low surface wettability typical of quasicrystalline materials..Overall, the results demonstrate that recycled precursors can be successfully employed to produce Al–Cu–Fe–Co quasicrystalline alloys with properties comparable to those obtained from high-purity raw materials, validating a sustainable and efficient processing route. Editor: Universidade Federal da Paraíba Tipo: Tese

2025-12-15T00:00:00Z