Ingeniería Civil y Mecánica

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Author: search.filters.author.Vallejo Espín, Byron EduardoSubject: search.filters.subject.MEZCLA ASFÁLTICA

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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.