https://repositorio.ifgoiano.edu.br/handle/prefix/230 2026-09-05T09:33:52Z https://repositorio.ifgoiano.edu.br/handle/prefix/6958 Título: SUBSTITUIÇÃO PARCIAL DE BIOCHAR EM RELAÇÃO AO CIMENTO PORTLAND PARA CONFECÇÃO DE CONCRETO E ARGAMASSA COM PROPRIEDADES DE ALTO DESEMPENHO SUSTENTÁVEL Autor(es): Agnonsou, Koffi Jean-Baptiste Primeiro Orientador: Alves, Michell Macedo Primeiro Membro da Banca: Alves, Michell Macedo Segundo Membro da Banca: Bacarji, Edgar Terceiro Membro da Banca: Sales, Marcel Willian Reis Abstract: The use of traditional mortar and concrete is essential in most construction and public works projects. However, these materials are primarily made from Portland cement, a component that is energy-intensive and generates a significant amount of greenhouse gases, contributing to global warming. This situation represents a considerable challenge for the construction sector, which must find a balance between sustainable development and growing infrastructure needs. Biochar, an organic charcoal produced by organic waste pyrolysis, can be used as an alternative to cement. Therefore, the main objective of this study is to develop a mixture that allows for the partial replacement of cement using rice husk waste products, from which high-performance concrete and mortar with improved properties will be produced, aiming for more efficient and sustainable solutions for the construction industry. The methodology used in this study included two main phases. Firstly, a literature review was conducted using the State of the Art by Systematic Review (StArt) software, with the goal of providing an overview of the current state of the subject, allowing the contents of the substitution to be defined. Next, the experimental phase began, which consisted of the mixing and production of mortars and concretes with partial cement replacement by biochar, specifically 1%, 5%, and 10% by mass. Chemical analyses were performed, notably the pozzolanic reactivity test according to the Chapelle method, in addition to physical characterization (density, porosity, and capillary water absorption) and mechanical testing (compressive strength). The results showed that the performance index for Portland cement at 28 days, expressed as a percentage (%), attained 176% after rounding to the nearest whole number, exceeding the minimum limit of 75% established by ABNT NBR 5752:2014 for evaluating the pozzolanic activity of Portland cement-based materials. The highest compressive strength of the mortars after 28 days of curing was obtained with a 10% replacement rate, that is, 28.24 MPa, while the reference mortar reached 18.17 MPa over the same period. For the concrete, the maximum strength was recorded with a 5% replacement rate at 56 days, reaching an average of 46.65 MPa, in contrast to the reference sample, which showed 35.56 MPa over the same period. The addition of biochar resulted in a reduction in the mortar’s water retention capacity, which decreased from 8.61% (reference) to 5.11% after the addition of 10% biochar. It is concluded that the addition of up to 5% biochar improves the physical-mechanical characteristics, while contributing to the decarbonization and sustainability of cementitious materials. Editor: Instituto Federal Goiano Tipo: Dissertação 2026-03-27T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6854 Título: AVALIAÇÃO DA DEMANDA HÍDRICA POR EMPREENDIMENTOS DE LAVAGEM DE VEÍCULOS NA CIDADE DE RIO VERDE - GO Autor(es): Vale, Alex Moreira do Primeiro Orientador: Silva Júnior, Édio Damásio da Abstract: This study aimed to evaluate the water demand associated with vehicle washing businesses in the municipality of Rio Verde (GO), Brazil, with emphasis on the exploitation of groundwater resources. The methodology integrated water use permit data obtained from the Water Resources Information System of the State of Goiás (SIRHGO) with information collected through on-site visits to establishments. Data regarding water consumption, types of washing systems, service profiles, and management practices were gathered and subsequently processed and spatially analyzed using QGIS software. The results showed a predominance of semi-automatic washing systems, as well as a strong dependence on groundwater abstraction. The total estimated water demand was 156,894.40 m³/month, a value significantly higher than the granted abstraction volume of 102,670.42 m³/month, indicating a possible discrepancy between actual consumption and established regulatory limits. Thus, vehicle washing activities represent relevant water use in the local context, with potential pressure on groundwater resources. The findings highlight the need for the adoption of more efficient technologies, as well as improvements in public policies and management instruments that promote the sustainable use of water resources. Editor: Instituto Federal Goiano Tipo: Dissertação 2026-05-29T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6575 Título: DESENVOLVIMENTO DE CONCRETO DE ULTRA ALTO DESEMPENHO COM INCORPORAÇÃO DE REJEITOS DE MINERAÇÃO E FIBRAS METÁLICAS Autor(es): Morais, Guilherme César Martins de Primeiro Orientador: Sales, Marcel Willian Reis Primeiro Membro da Banca: Castro, Alessandra Lorenzetti de Segundo Membro da Banca: Silva, Philippe Barbosa Abstract: This study investigates the development and properties of Ultra-High Performance Concrete (UHPC) with sand incorporation from mining tailings, seeking to combine high structural performance with sustainability in civil construction. The first chapter presents a systematic literature review that analyzes the state of the art of UHPC, highlighting the fundamental role of mineral additions and metallic fibers in optimizing the compactness of the matrix and ductility of the material. The second chapter details the experimental methodology and the materials used, focusing on the substitution of conventional fine aggregates with mining tailings, aiming to mitigate the environmental impacts of natural sand extraction and reduce production costs. The literature review suggests that the use of mining tailings is technically feasible, and there is a gap to be explored. The results indicate that the mechanical properties remain superior, with a compressive strength above 120 MPa, a dense matrix, and a refined ITZ as shown by SEM. When metallic fibers are incorporated, they combine high fracture energy, toughness, and tensile strength, which are fundamental for applications in critical infrastructure. Editor: Instituto Federal Goiano Tipo: Dissertação 2026-03-20T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6527 Título: ARGAMASSAS DE REVESTIMENTO À BASE DE BIOCHAR DO BAMBU E AREIA ARTIFICIAL Autor(es): Tamasauskas, Whellysonn Viana Primeiro Orientador: Alves, Michell Macedo Primeiro Membro da Banca: Sales, Marcel Willian Reis Segundo Membro da Banca: Bacarji, Edgar Abstract: The growing concern with sustainability in the construction industry has driven to research aimed at replacing conventional materials by alternatives that have a lower environmental impact. In this context, the present study evaluated the performance of rendering mortars with partial replacement of Portland cement by bamboo biochar and river sand by manufactured sand derived from crushed stone dust. Five experimental mixes were produced, with gradual substitutions of cement by biochar and natural sand by manufactured sand at levels of 0%, 3%, 5%, 7%, and 10%. The tests performed included compressive strength, bond strength, and capillary water absorption. A systematic literature review revealed that incorporating biochar between 1% and 5% can improve the mechanical strength of mortars. Microstructural analyses indicated an increase in hydration products formation, contributing to the improvement in mechanical performance. Experimental results confirmed that replacing up to 5% of the cement by biochar leads to significant gains in compressive strength and adhesion, while maintaining satisfactory performance in terms of capillary absorption. On the other hand, mixes with substitutions above 7% showed a reduction in mechanical performance. Regarding the fine aggregate, manufactured sand demonstrated technical performance compatible with that of natural sand, proving to be a viable and sustainable alternative. It is concluded that combining biochar and manufactured sand, in appropriate proportions, can contribute to the development of more sustainable construction materials without compromising essential properties such as mechanical strength and durability. Editor: Instituto Federal Goiano Tipo: Dissertação 2025-08-06T00:00:00Z