Engenharia Civil (UACSA)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2910
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APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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Item Análise estrutural e econômica de pavimentos flexíveis com adição de RAP na camada de revestimento, dimensionados pelo método do DNER e MeDiNa(2024-03-07) Silva, Carlos Henrique Cordeiro da; Costa, Laiana Ferreira da; http://lattes.cnpq.br/4147758573818185; http://lattes.cnpq.br/8220012340940005The Brazilian construction industry has been encouraged to invest in materials technology, mainly those that meet the precepts of sustainability, and updates on methods for sizing flexible pavements, considering that a large portion of Brazil's road network consists largely of this type of pavement and has suffered from premature wear, leading to constant maintenance. The reuse of milled material, also called Reclaimed Asphalt Pavement (RAP), has emerged as an alternative for reducing paving costs and the environmental impact caused by this service. This research sought to make a structural and cost comparison of implementing pavements with the addition of RAP at rates of 0%, 10%, 30%, and 50% in the surface layer, sized by the method of the National Highway Department - DNER (1981) and by the National Sizing Method (MeDiNa). Initially, data collection was conducted from literature sources on the materials that would be used in the layers of the pavements studied. After sizing, a structural and implementation cost comparison was made for one kilometer of road for all the structures proposed in the research. Structure 01, with 0% RAP and sized by DNER (1981), had the lowest cost, however, upon analyzed by the MeDiNa, permanent deformation failure was observed in the first month of the project and fatigue at the 25th month of use. Structure 02, with 0% RAP, was the costliest among all, however, like the other structures sized by MeDiNa, it will withstand traffic demands over the project’s duration (10 years). The number of equivalent fatigue failure requests (Neq) between the structures showed that structure 02 is 67% more economical. For the other structures, as the RAP content increases, the implementation cost decreases, reaching a reduction of 79% for the structure with 50% RAP in its surface layer. Therefore, through the results obtained in the research, it was observed that MeDiNa proved to be more suitable for meeting the estimated project time, besides allowing the use of different types of materials available for pavement execution without compromising its efficiency, as is the case with recycled asphalt mixtures containing RAP. It was also observed that increasing the RAP content in the asphalt mixture reduces the cost of the structure, saving cost in pavement implementation.Item Levantamento bibliográfico sobre a influência da adição de óleos vegetais nas propriedades mecânicas de misturas asfálticas recicladas(2023-04-28) Silva, Ysdney Gomes da; Costa, Laiana Ferreira da; http://lattes.cnpq.br/4147758573818185; http://lattes.cnpq.br/2997436927105572Environmental causes are increasingly gaining prominence worldwide, bringing the need to reduce the use of natural resources. The use of milled material (Reclaimed Asphalt Pavement - RAP) in new asphalt mixtures has gained visibility, because it promotes savings in the use of virgin materials and energy costs. The use of high percentages of RAP, above 30%, will generate asphalt mixtures with high stiffness, making them susceptible to premature fatigue cracking. The addition of recycling agents provides a partial restoration of the RAP properties, making the recycled mix mechanically feasible. Vegetable oils are an excellent alternative recycling agent, because they are rich in unsaturated fatty acids, contributing to reduce the stiffness of mixtures with high content of RAP, besides being environmentally friendly. In this sense, the present work gathered, through a literature review, data on the mechanical behavior of recycled asphalt mixtures with the addition of vegetable oils. The papers were collected using the databases ResearchGate, Scientific Electronic Library Online (SciELO), Portal de Periódicos da CAPES and Google Scholar, prioritizing publications after 2015. For this, an analysis and description of the results obtained by each author was performed, verifying the behavior for the mechanical properties of Marshall stability, resilience modulus, tensile strength, fatigue life, and susceptibility to induced moisture. After that, with the use of scatter plots built for each property, a trend study was carried out seeking to establish relationships between variations in RAP content, oil content, and type of oil used in the mixtures. The results indicate that the use of vegetable oil in recycled asphalt mixtures promotes a mechanical behavior similar to that of conventional mixtures, when added with levels generally up to 10%. For percentages above 10%, it can lead to excessive softening of the recycled asphalt mixtures, thus compromising their mechanical performance.