Ingeniería Civil y Mecánica

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Start date: 2024Subject: search.filters.subject.MEZCLA MODIFICADA

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    Evaluación de las propiedades mecánicas de un pavimento flexible tradicional y un pavimento flexible combinado con asfalto reciclado y escoria de siderurgia entre las calles Corazón y Cordillera Occidental del cantón Ambato de la provincia de Tungurahua.
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2025-02) Vallejo Espín, Byron Eduardo; Chérrez Gavilanes, Diego Sebastián
    In Ecuador's steel industry, large quantities of steel slag are generated annually, leading to considerable environmental pollution. To mitigate this impact, the incorporation of recycled materials into asphalt mixtures was proposed, including reclaimed asphalt pavement (RAP) and slag as a polymer, aiming to achieve environmental benefits and improve pavement quality. The research was divided into three phases. The first phase involved identifying the extraction sites of materials such as bitumen, aggregates, and recycled materials. In the second phase, the materials underwent characterization tests, including particle size analysis, aggregate density, abrasion tests, Rice test, and the Marshall method. The latter was used to evaluate the stability and flow of briquettes. The experimental design included steel slag and RAP combined with optimal asphalt content (5.5, 6.0, and 6.5 percent). Slag partially replaced fine aggregates (passing the No. 4 sieve), while RAP partially replaced intermediate coarse aggregates (half-inch sieve, retained on the No. 4 sieve). Combinations of 7 percent slag with 10 percent RAP, 10 percent slag with 20 percent RAP, and 13 percent slag with 30 percent RAP were tested. In the third phase, a comparative analysis was conducted based on Marshall criteria between traditional and modified mixtures. The results showed that modified asphalt mixtures with 6.5 percent AC-20 content, incorporating 7 percent slag and 10 percent RAP, and 10 percent slag and 20 percent RAP, as well as those with 6.0 percent AC-20 content, incorporating 13 percent slag and 30 percent RAP, outperformed or equaled traditional mixtures in terms of strength, durability, and environmental sustainability. These mixtures present themselves as a stronger and more eco-friendly alternative for road infrastructure projects.
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    Evaluación del comportamiento de las propiedades mecánicas del asfalto utilizando ceniza de cáscara de nuez con asfalto reciclado
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2025-02) Viteri Lascano, Ana Michelle; Guevara Robalino, Jorge Javier
    The incorporation of recycled materials in asphalt mixtures represents an innovative and sustainable alternative to reduce global pollution, aiming to offer benefits both in pavement quality and environmental preservation. This approach also contributes to waste reduction, optimizes the use of natural resources, and promotes more environmentally friendly and responsible construction practices in the long term. This process was developed in three stages. In the first, the appropriate site for collecting materials was selected. In the second, the materials were subjected to various tests, such as granulometry, abrasion, the Rice test, and the Marshall method, in order to evaluate their properties of stability, flow, air voids, and asphalt-filled voids. For the design, walnut shell ash and RAP were added, using optimal asphalt contents of 5.5, 6.0, and 6.5 percent. The walnut shell ash partially replaced the fine aggregate passing through the No. 4 sieve, while RAP partially replaced the intermediate aggregate of 3/8, passing through the half-inch sieve and being retained on the No. 4 sieve. Thus, walnut shell ash and RAP were incorporated in proportions of 7 percent ash – 10 percent RAP, 10 percent ash – 20 percent RAP, and 13 percent ash – 30 percent RAP. In the third phase, a comparative analysis of the modified asphalt mixtures and the conventional mixture was conducted using the Marshall method criteria. The results showed that, by incorporating walnut shell ash and RAP in the mentioned proportions, most of the tests did not meet the mechanical property ranges of the mixture compared to the traditional one, concluding that the modified mixture does not outperform the conventional one in terms of resistance, durability, and environmental sustainability.
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    Evaluación de las propiedades mecánicas asfálticas modificadas con polvo de gres porcelánico en pavimentos flexibles reciclados
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-08) Delgado Lucio, Jennifer Johanna; Bayas Altamirano, Myriam Marisol
    The integration of recycled materials into asphalt mixtures is an innovative solution to reduce global pollution, seeking to provide benefits both in pavement quality and in improving the environment. It was divided into three phases, the first was based on identifying the site for the extraction of the materials. In the second, the materials were subjected to tests such as: granulometry, abrasion, rice test and Marshall method to analyze stability and flow properties. For the design, stoneware and RAP were added, plus the optimal asphalt content of 5.5, 6.0 and 6.5 percent. The porcelain stoneware partially replaced the fine aggregate when passing the No. 4 sieve and being retained in the No. 50, on the other hand, the RAP partially replaced the 3/8" intermediate aggregate when passing the 1/2" sieve and being retained in No. 4. Consequently, stoneware and RAP were partially incorporated with percentages of 7 stoneware – 10 RAP, 10 stoneware – 20 RAP and 13 stoneware – 30 RAP. Finally, in the third, a comparative analysis was carried out according to the Marshall criteria between the modified asphalt mixtures and the traditional mixture. These phases resulted in incorporating stoneware and RAP with percentages of 7 stoneware – 10 RAP, 10 stoneware – 20 RAP and 13 stoneware – 30 RAP, plus 6.5 percent asphalt, improving the mechanical properties of the mixture compared to the traditional mixture, concluding that the modified asphalt mixture surpasses the traditional one in terms of resistance, durability and environmental sustainability.