Ingeniería Civil y Mecánica

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Has files: YesSubject: search.filters.subject.AGUA DE CURADO

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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 del módulo de elasticidad estático del hormigón estructural en base a su resistencia a la compresión, fabricado con materiales de las minas Trópico de Capricornio y Santa Isabel, ubicadas en el sector El Barranco cantón Mera en la provincia de Pastaza
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2020-09) Flores Medina, Pablo Xavier; Medina Robalino, Wilson Santiago
    The present experimental work began with the sampling of the aggregates of the two mines, following the guidelines of INEN 695 and their subsequent reduction to test size according to INEN 2566; Therefore, arid characterization studies were developed to decree their suitability to be used in structural concrete identified in INEN 872; in addition to achieving the actual density of INEN 156 cement. Based on the above, the design of mixtures with their respective dosage was developed for the compression resistances of the 21 and 28 Mpa concrete, with the help of the optimal density method. A single dosage was used because in test trials if they achieved the expected resistances; a total of 84 specimens were then tested according to INEN 3124;with their respective fresh trials such as: INEN 1763 sampling, density, air content and INEN 1579 performance, INEN 1578 settlement; as well as in hardened state obtaining the resistances to INEN 1573 compression at ages 7, 14, 21 and 27 days, making it possible to graph the curves age vs resistance to compression and stress vs deformation of structural concrete. Finally, the static elasticity modulus of concrete was determined according to ASTM C469 and accordingly the constants are proposed for local adaptation depending on the origin of material equation used that is presented in the present experimental work.