Ingeniería Civil y Mecánica

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Subject: search.filters.subject.CARACTERÍSTICAS MECÁNICAS

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    Análisis del módulo de elasticidad estático del hormigón en base a su resistencia a la compresión, fabricado con materiales de las minas Pungal Grande y Miraflores, ubicados en el cantón Guano provincia de Chimborazo
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-03) Flores Lescano, Mario Fabricio; Navarro Peñaherrera, Carlos Patricio
    The present work has the purpose of providing information about the static elastic modulus proposed by NEC-SE-HM, section 3.3.3, which refers to the equation established by the ACI 318 committee. Analyzing the physical and mechanical properties for the material stone from the mines: Pungal Grande and Miraflores in the canton of Guano, province of Chimborazo. The characterization tests of the materials were carried out as indicated in NTE INEN 872, once the physical-mechanical characteristics of the materials were obtained, the final dosages were made using the maximum density method for a compressive strength of 21 and 24 MPa at the 28 days old. During the preparation process of the mixture, tests were carried out on the concrete in its fresh state, such as sampling according to NTE INEN 1763; the determination of settlement in accordance with NTE INEN 1578, the density, performance and air content as indicated by NTE INEN 1579. And finally, the cylindrical specimens were prepared in accordance with what is indicated by NTE INEN 3124. Concluded with the curing process, we proceeded to the realization of tests of the concrete in hardened state, obtaining its resistance to compression for ages of 7, 14, 21 and 28 days according to what NTE INEN 1573 proposes. Concluding with the experimental project, the static modulus of elasticity was determined based on the process indicated by ASTM C469 and the tentative modulus with the equation proposed in ACI 318, to finally compare and analyze them.
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    Análisis de las características mecánicas de un material compuesto de matriz polimérica reforzado con partículas de caucho de neumáticos reciclados y su incidencia en las propiedades mecánicas.
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2019) Acosta Benavides, Carolina Nataly; Espín Lagos, Segundo Manuel
    The addition of recycled tires rubber particles in thermostable polymers is a shape to promote the recycling of scrap tires, replacing traditional materials with environment friendly composite material, for this reason, the present project had as objectives to obtain the composite of recycled tires rubber particles and polyester resin with reinforcement concentrations of 30%, 35% and 40% for three different sizes of particles, manufacture test pieces standard and characterize the composite through Flexural, Compressive and Hardness tests under the standards ASTM D7264-07, ASTM D695-15, ASTM D785-03 and ASTD 2240-05 respectively and Fractography. This allowed to obtain experimentally the mechanical properties of the composite, obtaining as a result that the combination of 30% rubber particles of G1 particle size and 70% polyester resin presented the best mechanical properties with: the máximum flexural stress of 13,16 MPa, flexural modulus of elasticity of 425,46 MPa, maximum strain of 3,21%, maximum compressive stress of 7,49 MPa, yield stress of 1,94 MPa, compressive modulus of elasticity of 37,40 MPa, compressive strain of 20,29%, and 17,01 Rockwell hardness. Also, it was determined that the incorporation of rubber particles in the polyester resin had a negative impact on the máximum flexural and compressive stress, flexural and compressive modulus of elasticity, and hardness, but it bear higher flexural and compressive strain. The composite material is adequate for the manufacture of headlights edge of a Hino AK bus with a mínimum thickness of 3 mm, because it complies with a minimum safety factor of 2,931, ensuring the suitable performance of the piece in aerodynamic conditions.