Ingeniería Civil y Mecánica

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    Influencia del fuego en la resistencia a compresión del hormigón elaborado a partir de material reciclado
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-09) Quishpe Toapanta, Byron Javier; Peñafiel Valla, Lourdes Gabriela
    Because concrete is a material widely used in construction characterized by its high compressive strength, factors such as fire could cause problems in its internal and external functionality. That said, the objective of this research is to analyze the behavior that concrete with recycled aggregate will have, coming from residual concrete, whose purpose is to obtain experimental results that demonstrate how fire affects its compressive strength. For this experimental investigation, the optimal density method will be used to design the dosage with a resistance of 240 kg/cm2, within which 45 cylindrical test tubes were made, distributed 15 each with replacements of 0, 15 and 30 percent of natural aggregate by recycled aggregate. The specimens, after being cured at 28 days of age, were subjected to direct fire by means of a smelting furnace. With the help of a pyrometer, the temperatures that were exposed were controlled, which range from 0, 250, 400, 600 to 800 degrees Celsius during a determined period of time. For each temperature, 3 cylindrical concrete samples will be tested. Once exposed to the fire, they were cooled for 24 hours, to later be tested for compression. From the results obtained, it is shown that the compressive strength decreases as a function of each increase in temperature, looking unfavorable to those specimens that were replaced with 30 percent RA, in addition to this, various pathologies such as cracks, fissures, color changes and the phenomenon of chipping or spalling occurred.
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    Análisis de la resistencia a compresión del concreto expuesto a fuego, elaborado a base de talco industrial como remplazo parcial del agregado fino
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Civil, 2017) Moreno De la Cruz, Daniel Eliecer; Frías Torres, Alex Xavier
    In this project the intention is to provide technical information about the influence of use industrial talc as a partial replacement of fine aggregate in concrete mixtures, by the preparation and testing of test pieces, using materials from our area and Holcim cement. With materials previously selected and analyzed, test mixtures were prepared by adding and varying the amount of industrial talc, guided by the procedure applied by the current NTE INEN standards. For the dosage of calculated 210Kg / cm², 2 specimens were tested, the same ones that were tested at 7 days of age. From the analysis of these results and the respective readjustments, the design of mixtures with replacement of industrial talc by fine aggregate and the heat treatment tests (temperature rise), compression test at 28 days of age. From these values, the mixture was selected with the highest percentage of industrial talc, it should be clarified that this experimental work was oriented to obtain the best residual resistance of the concrete exposed to a thermal shock (abrupt change in temperature). The dosage that gave the best results to the simple compression after the thermal shock is the one that contains 20% of industrial talc as partial replacement of the fine aggregate. After the heat shock test at 28 days of age a residual resistance of 104.11 Kg / cm², was obtained at a temperature of 500 ° C.
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    Estudio del comportamiento del acero de refuerzo expuesto al fuego durante diferentes periodos de tiempo
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Civil, 2017) Manobanda Guaquipana, Cristian Eliecer; Núñez Aldás, Galo Wilfrido
    This experimental work aims to study the behavior of reinforcing steel exposed to heat during different periods of time. Thus, determined tensile strength, ductility and elongation of the steel reinforcement. The steel reinforcements were extracted of reinforced concrete beams with strength were of 210 Kg/cm², these reinforced concrete beams were cured in the laboratories of the Faculty of Civil Engineering and mechanics, once concrete reaches its maximum resistance to compression at 28 days of age the beams were classified into two groups, not exposed to fire beams and the beams exposed to fire to different time periods. These specimens were burned in a furnace at different intervals of time such as: 30 minutes, 60 minutes, 90 minutes, 120 minutes, 150 minutes, 180 minutes with temperatures (820° C, 940 C, 980° C, 1000° C, 1100° C, 1150° C), these specimens went through a 24 hours friendly cooling process, then proceeded to break the concrete to obtain the steel reinforcement, prior to a tensile test proceeded to the identification and preparation of the dimensions of 50 cm to obtain a zone calibrad a or 20cm test area, was verified trials that the reinforcing steel has a 4200 PSI yield strength based on the standard of the Ecuadorian Institute for Standardisation (INEN 2167). Identified different levels of tensile strength of test specimens exposed to fire to a temperature greater than 1000° C decreases considerable mind their resistance 16.24% causing loss of section, cracking, crack resistance and cracking of the steel reinforcement.
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    Estudio del comportamiento del concreto estructural expuesto al fuego
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Civil, 2016) Alvarado Aguirre, Giovanni Josué; Ureña Aguirre, Maritza Elizabeth