Ingeniería Civil y Mecánica

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Subject: search.filters.subject.AGREGADOS PÉTREOS

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Now showing 1 - 4 of 4
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    Evaluación del efecto de la adición de caucho vulcanizado triturado en mezclas asfálticas en frio
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-09) Quimbita Loma, Estefania Gabriela; Bayas Altamirano, Myriam Marisol
    As the days go by, the problem of environmental pollution is a critical problem for society, so it has become necessary to create new techniques for recycling products that daily increase in the different deposits of our country, such as tires that are transferred to deposits for their final disposal, which do not have the technique for their elimination, resulting in a negative environmental impact, and can be used for the construction of roads. The purpose of this research is to add crushed vulcanized rubber in cold asphalt mixtures by elaborating 3 briquettes for the percentages of 0, 3, 6, 9, 12 and 15 percent of rubber addition, with stone aggregate obtained from the Herrera quarry in the city of Latacunga, applying the Marshall method to obtain parameters that will later allow us to design a flexible pavement structure. Once the briquettes were made, we proceeded to test the stability and flow, giving the optimum percentage for the sample without rubber of 6.03, and with crushed vulcanized rubber 3, 6, 9, 12 and 15 percent, with optimum percentages of 6.2, 6, 6.13, 6.03, and 5.9 percent respectively, indicating that as the percentage of crushed vulcanized rubber increases, the stability decreases but the flow increases, that is to say, the sample remains elastic. For the design of a flexible pavement structure, the thickness of the asphalt slab is 5 cm, for base of 10 cm and subbase of 10 cm.
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    Análisis experimental de la capacidad filtrante de drenaje de los agregados pétreos provenientes de la mina Los Moelles ubicada en la parroquia San Andrés, cantón Píllaro, provincia de Tungurahua
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-08) Hernández Carvajal, Vanessa Nathaly; Paredes Beltrán, Bolívar Eduardo
    Due to the diversity of voids, sizes and shapes, as well as the complex distribution of the soil, the flow of water through its mass is more complicated than through a tube or hole. To facilitate drainage, it is preferable to have a permeable soil. This study determined the physical properties of the soil, such as: Moisture Content, Atterberg Limits, and Granulometry. Using the AASHTO method, the soil is classified as Gravels and Silty or Clay Sands A-2-4 (0), while, by the SUCS method, soil samples 1, 3, and 4 are classified as poorly graded sand with silt with SP-SM gravel, sample 2 as poorly graded sand SP, and sample 5 as Poorly graded sand with SP-SM silt. For this purpose, a constant head drainage permeameter was used to determine the coefficient of permeability of the gravel, sand and silt of each sample. The results obtained indicate that the coarse aggregate has a high degree of permeability; the fine aggregate, a degree of medium permeability; and silt, a low degree of permeability. Finally, different combinations with different percentages of aggregates were carried out, concluding that the most efficient mixture contains coarse gravel, sand and fine gravel, with a medium degree of permeability, being within the range of permeable soils as established by the FAO.
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    Análisis comparativo de las propiedades mecánicas de un hormigón hidráulico (TIPO GU) de F´C = 240 kg/cm2 con diferentes dosificaciones de silicato de sodio y nanosílice utilizando agregados de la mina Santa Isabel ubicado en la via Shell – madre tierra, ciudad de Puyo – provincia de Pastaza
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2020-10) Caiza Yungán, Jefferson Raúl; Suquillo Ronquillo, Betzabeth Jessenia
    This paper has been carried out in order to determine the influence of sodium silicate and nanosilica as partial substitutes for cement on the compressive strength of concrete and its performance in the mix design. Initially it was carried out the analysis of the physical-mechanical properties of the stone aggregates from the Santa Isabel Mine located on the Shell - Madre Tierra road in Puyo city, Pastaza Province, from which good results were obtained that comply with NTE INEN and ASTM standards. After an investigation of these two additions, the standard concrete dosage of compressive strength of 240 kilograms per square centimeter was carried out, and it was used as a reference for partially replacing the cement with sodium silicate in concentrations at 4 per cent, 8 per cent and 12 per cent and nanosilica at 1 per cent, 3 per cent and 5 per cent. The respective specimens were prepared with each of the additions and tested for compression at 7, 14 and 28 days. It was determined that the optimum addition of sodium silicate was 8 per cent and of nanosilica was 3 per cent with compressive strengths of 276.58 kilograms per square centimeter and 355.31 kilograms per square centimeter respectively, both measured at 28 days, denoting a considerable increase in compressive strength from the reference value. After analyzing the variables of resistance, settlement, consistency and workability, it was determined that the best performing addition and with economic savings in construction is the addition with 3 per cent of nanosilica.
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    Análisis de la presencia de gas radiactivo radón en agregados pétreos de la provincia de Tungurahua y su incidencia en la construcción
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2020) Chicaiza Gómez, Néstor Fabricio; Suquillo Ronquillo, Betzabeth Jessenia
    This work analyzed the meteorological parameters that influence at presence of gas radon222 in the mining of building materials (gravel and sand) of Tungurahua province, the parameters analyzed were geological structure of the soil, temperature and water precipitation around of minings, furthermore is important consider the population that inhabit or frequent these places. The work determined the physical and mechanical properties of aggregates to study the influence in the emanation, transport and exhalation of radon222 and the total exhalation calculated for a concrete building with f'c 180 and 210 kilograms per square centimeter. The emanation of gas radon is limited by high percentages of moisture content in situ, and the high capacity of absorption on the aggregates, with concentrations of (18.33 plus or minus 8.89) y (21.96 plus or minus 7.84) becquerel per cubic meter in sand and gravel. The voids generated in the concrete due to the different sizes of sand and gravel determinate by granulometry test; these voids influence the gas radon222 transporting indoor of building. The effective annual dose due to radon222 inhalation, produced in a basement with a volume of 333 cubic meters of a representative housing in the area and with an occupation factor of 4750 hours per year is 0.260 milis sievert per year with a margin of error of plus or minus 10 percent.