Ingeniería Civil y Mecánica

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Subject: search.filters.subject.DENSIDAD ÓPTIMA

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    Resistencia a compresión del hormigón preparado a partir de materiales reciclados
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-03) Mayorga Amaguaya, Larot David; Peñafiel Valla, Lourdes Gabriela
    The present investigation seeks to solve the great problem of contamination generated by waste from the construction sector with reference to demolitions and debris generated in cities, applying the reuse of these same materials to reduce the volume towards dumps, which direct sustainable constructions. The percentage of recycled concrete aggregate that can be partially replaced by coarse natural aggregate and its influence on compressive strength was determined. For this, recycled concrete from tested cylinders, sidewalk residues, among others, was collected; the properties of the aggregates were obtained according to the INEN and ASTM standards; Subsequently, the dosage was carried out by the Optimum Density Method for a resistance of 210 kilograms per square centimeter with the replacement of percentages of recycled aggregate from 10, 15, 30, 60 and 100 percent according to the weight of the coarse aggregate, and at its At the same time, concrete specimens prepared in the traditional way were made for the comparison of their resistance. In this way, it was identified that the greater the amount of recycled aggregate, its compressive strength decreases, evidencing that it is feasible to make replacements with percentages lower than 30 percent, since both 10 and 15 percent present favorable design values such as 214.54 and 211.57 kilograms. per square centimeter at 28 days.
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    Estudio de mampuestos a base de la reutilización de desechos producto de demoliciones encontrados en los diferentes botaderos del cantón Ambato, provincia de Tungurahua
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2022-09) Gamboa Chamba, Edwin Danilo; Chérrez Gavilanes, Diego Sebastián
    Due to the problem currently presented by the excessive contamination of waste product of the demolition of the construction and to try to reduce costs for the material of the manufacture of the masonry. The present experimental work began by visiting some dumps that accumulate waste from demolitions for collection, the white powder was obtained from the San José mine located on the Vía a Pujilí, then the recycled material was crushed in the Arias Mine, located on the Vía to Aguaján, once the material was obtained, several granulometric, absorption and density tests were carried out on all the materials under the INEN standards in the Laboratory of Soil Mechanics and Materials Testing of the Faculty of Civil and Mechanical Engineering of the Technical University of Ambato. Subsequently, the masonry was dosed using the optimal density method. The compressive strength tests were carried out at 14 and 28 days of age, while the impact resistance tests at 28 days. The compressive strength was 3.78Mpa in common masonry, and in the masonry with total replacement, 8.11Mpa was obtained, thus determining an increase of 53.39 percent. It was also observed that in the impact test, the higher percentage of substitution the masonry had, the less damage it presented. Finally, it was deduced that the higher the substitution percentage, the greater the weight of the masonry and the lower its water absorption capacity.
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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.