Ingeniería Civil y Mecánica

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    Análisis comparativo del material proveniente de las canteras “Mollepamba”, “Rubí 2” y cantera Rumipamba de la provincia de Cotopaxi utilizado para la elaboración de base y subbase en la construcción de carreteras
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-08) Supe Castro, Jonathan David; Viscaíno Cuzco, Mayra Alexandra
    The comparative analysis of the material coming from the quarries “Mollepamba”, “Rubí 2” and “Rumipamba” in the province of Cotopaxi, Ecuador, was carried out due to several problems in the roads surrounding the sector that presented structural deficiencies in the granular base and subbase materials, producing subsidence, fissures, cracks among other problems that affect the trafficability and safety of the roads. The research analyzed the index and mechanical properties of the quarry materials through various laboratory tests to determine if they comply with the Ecuadorian road standard NEVI -12. The moisture content, Atterberg limits, granulometry, maximum density and bearing capacity (CBR) were evaluated. In addition, abrasion resistance, percentage of fractured faces and sulfate wear were tested to determine durability and wear resistance. The test results were compared between the three quarries to identify the suitability of the materials for base and subbase applications. The results show that the materials from the Mollepamba quarry met all the requirements of the Ecuadorian road standard NEVI-12, proving that they are suitable for use in road construction. The materials from the Rumipamba and Rubí 2 quarries comply with most of the parameters evaluated, indicating their good quality. These results emphasize the importance of carrying out thorough evaluations of the materials before using them in road projects.
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    Análisis de dureza, resistencia a la tracción y desgaste de materiales termoplásticos obtenidos a partir de la resina Tough de prototipado robusto para impresión 3D por estereolitografía (SLA)
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-01) Villena López, Oscar Rodrigo; Pérez Salinas, Cristian Fabian
    For this experimental work, Clear resin and Tough resin were used. Clear resin is one of the most widely used commercial prototype resins. On the other hand, Tough resin is used in the engineering field (mainly in scale mechanical components). All these resins are used in stereolithography 3D printing. The investigation considered 3 different post-cure times, all of them recommended by the manufacturer. Three types of curing were used: no curing, normal curing and maximum curing. For the Clear resin, post-curing times of 0, 15 and 30 minutes were applied under the incidence of UV rays. While for the Tough resin, times of 0, 60 and 120 minutes were considered. The CAD models were produced taking into account international testing standards (ASTM D638 and ISO 9352). This is due to hardness, traction and abrasion tests. The abrasion and hardness tests were carried out in the university laboratories. The tensile test is a compendium of several authors whose information has been verified and approved, that is, their level of confidence is high. Once the tests had been carried out, it was determined that the standard resin (Clear), in terms of hardness, has a higher grade compared to Tough. On the other hand, Engineering resin (Tough) has less resistance to abrasion. The tensile results affirm that both resins do not have a marked difference in their behavior.
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    Evaluación superficial y estructural del pavimento de la av. Pitágoras desde el redondel de Terremoto Km 0+000 hasta el caserío San Luis km 4+000 de la parroquia Picaihua del cantón Ambato provincia de Tungurahua
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-02) Villegas Freire, Lucero del Belen; Moreira Cedeño, Fricson Lutgardo
    The road infrastructure of a city is an indispensable part for the economic and social development, therefore, the respective studies were carried out, determining that the road of the sector under study is currently in poor condition, which affects the safety, stability and reliability of the user. For this purpose, we began with a study of the current and projected TPDA; subsequently, the PCI of 15 sample units was determined and the Benkelman Beam test was performed at 9 points; the following tests were also carried out: DCP, abrasion, granulometry, Atterberg limits and CBR. Finally, a maintenance plan was proposed by sections based on track damage. As a result, in 20 years the road will be classified as a class I collector with a projected TPDA of 4,976 vehicles/day. As for the PCI, it was determined that from the 0+000 to the 2+730 abscissa it is in poor condition, for this reason, rehabilitation was proposed; however, from the 2+730 to the 4+000 abscissa it is in good condition, therefore, it only requires maintenance. On the other hand, with the Benkelman beam, it was determined that the first section has type III deflection, while the second has type I deflection. On the other hand, with the aforementioned tests it was identified that the road is made up of a granular layer corresponding to a class 4 base and a subgrade made up of silty sand. Finally, the budget required for maintenance is US $507,274.55.