Ingeniería Civil y Mecánica

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Subject: search.filters.subject.MÉTODO MARSHALL

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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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    Análisis del comportamiento del asfalto reciclado mezclado con vidrio de la vía Cevallos – Mocha en el tramo km 0 + 000 al km 3 + 306 de la provincia de Tungurahua
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-02) Fernández López, Jorge Estuardo; Bayas Altamirano, Myriam Marisol
    Currently, various techniques are used for the design of asphalt mixtures; however, in Ecuador, the implementation of materials such as crushed glass and asphalt pavement has not been fully accepted. The current project aims to analyze asphalt mixtures with partial substitution of these recycled materials, addressing both the environmental and economic aspects. Therefore, we started with a preliminary study where we collected data on the road under study and basic information on the incorporation of RAP and crushed glass, tests were carried out on the stone aggregates and recycled materials in order to evaluate their quality and determine their mechanical properties, 15 conventional briquettes were made, Through the Marshall method, an optimum percentage of asphalt was obtained, allowing to obtain an adequate asphalt mixture that served as a base to substitute the proportions of the materials in question, four design alternatives of asphalt mixtures were executed, which had different percentages of crushed glass and recycled asphalt. The first three alternatives worked with the optimum AC-20 content of the conventional asphalt mix, while for the last alternative an optimum content of 6.65 percent AC-20, 4.82 percent RAP and 4.42 percent crushed glass was determined. All the asphalt mixes were evaluated using parameters established by the MOP-001-F-2002 standard. As a result, and in compliance with the last objective of the project, the respective master formulas were established for each asphalt mix design executed.
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    Evaluación del estado de la capa de rodadura y su proyección en la conservación vial de Quero, Pelileo, Patate y Píllaro de la provincia de Tungurahua y su efecto en la conservación vial
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-09) Zambrano Cedeño, Alexander Israel; Frías Torres, Alex Xavier
    In this experimental project, the need for the province of Tungurahua to maintain the intercantonal road network is presented, since the people of Tungurahua must maintain the road network in good condition, being a central province in the country, it is key for socio-development. economic, intercommunication and tourism. In the experimental project presented, a georeferenced survey of the roads under study was carried out, where the coordinates were digitized, obtaining a 2D model. Afterwards, a visual study of the road was carried out applying the PCI (PAVEMENT CONDITION INDEX) method, finding 19 different types of failures on the road surface of the roads under study, these failures are in ranges of mild, medium and high. A solution is proposed that helps road conservation with rehabilitation; a modified pavement with PVC (vinyl plochloride) is proposed, where 1, 2 and 3 percent of fine aggregate was replaced by PVC. As a result, it was obtained that the average PCI is 60.34 percent on the Patate – Pillaro road, 71 in Pelileo – Patate, 81 in Quero – Salasaca and 83.5 in Patate – Baños, on the other hand the pavement modified with PVC using the MARSHALL test. for flexible pavements resulted in the addition of this material improving the mechanical characteristics of the flexible pavement with an optimal percentage of AC-20 of 6.5 percent and 3 percent of PVC, obtaining stability and flow values of 4469.21 lb, 13 percent hundred. cent respectively.
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    Análisis comparativo de la mezcla asfáltica modificada con la adición de polímeros termoplásticos, caucho de llanta reciclado y pavimento asfáltico tradicional para el mantenimiento vial en fallas piel de cocodrilo
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-07) Sarabia Lescano, Karen Nicole; Frías Torres, Alex Xavier
    This research work was carried out with the objective of analyzing and comparing the mechanical properties of modified asphalt mixes with the addition of: thermoplastic polymers and recycled tire rubber compared to traditional asphalt. Asphalt briquettes were made: modified and conventional using the Marshall Method, then the behavior of an asphalt mixture was analyzed by modifying it with the addition of the following thermoplastic polymer percentages of 5, 10, 15 and 20 percent by weight; and rubber, 2, 3, 4 and 5 percent were used, where 36 samples were manufactured, of which 12 correspond to conventional asphalt mixes and 24 to modified mixes; By using these materials, the optimum percentage of recycled polymers that can be added to asphalt mixtures was achieved, largely fulfilling and improving the design requirements established by the standards so that they can be used in the paving process. It was determined that the hot mix asphalt modified with tire rubber did improve some of the mechanical properties, since it presented resistant and durable characteristics, obtaining an optimal percentage of addition of 5.7 percent of rubber and an optimal percentage of addition of 6.6 percent thermoplastic polymer.
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    Efecto de adición de partículas de plástico reciclado en las propiedades físico-mecánicas de pavimento
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2022-09) Vargas Guevara, Alex Javier; López Arboleda, Alex Gustavo
    The main purpose of this experimental investigation is to compare an asphalt mixture with the addition of recycled plastic particles from bottles, without cap or label, with a flake size of 0.30 mm in diameter and the traditional asphalt mixture. By means of the Marshall design for Asphalt Bituminous Mixes according to AASHTO T245, ASTM D 1559, AASHTO T225 standards, in order to analyze the results obtained in the laboratory of the Municipality of Ambato. The recycled plastic particles were added to the previously screened hot mix asphalt, with which the physical and mechanical characteristics of 15, 20 and 25 percent modified asphalt were determined. Previous tests were carried out on the stone aggregates from the quarry owned by Constructora Alvarado CÍA LTDA, indicating optimum values. The specific characteristics of the traditional asphalt mix comply with the parameters according to the MOP-2002 in optimum stability of 1650 pounds, vacuum ratio 4 percent and flow of 11 inches for Marshall method; the optimum bitumen content for the stone aggregates was 6.5 percent bitumen. Once the different addition percentages were performed, the 15 percent recycled plastic percentage determined an optimum stability of 4220 pounds, 4 percent vacuum ratio and flow or deformation of 14 inches for heavy traffic. These values are equivalent to the optimum percentage meeting Marshall's mechanical specifications