Ingeniería Civil y Mecánica
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Item Resistencia a la compresión del hormigón simple fabricado con agregado fino proveniente de hormigones reciclados(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-02) Salinas Freire, Bryan Paúl; Peñafiel Valla, Lourdes GabrielaThe integration of recycled materials in the manufacture of concrete is presented as a viable alternative to mitigate the environmental impact of the construction industry. In this study, we seek to determine the optimal percentage of substitution of recycled fine aggregate in concrete in place of natural fine aggregate, focus ing on evaluating its impact on compressive strength. The recycled material was obtained from a crushing process of laboratory specimens, sidewalk debris and curbs; both recycled aggregate and natural aggregates were subjected to analysis according to INEN standards, then the design of concrete dosages of 210 kg/cm2 and 240 kg/cm2 was carried out using the Optimal Density Method developed by the Central University of Ecuador. Subsequently, reference specimens were prepared using natural materials to compare their resistance with specimens in which the natural fine aggregate was replaced by recycled fine aggregate in percentages of 10, 15, 30, 30, 60 and 100 percent. The results show that there is a decrease in the compressive strength as the percentage of recycled fine aggregate increases. However, it is observed that replacement percentages of 10 to 30 percent can provide acceptable compressive strengths. This highli ghts the potential of recycled materials for concrete manufacturing as a promising solution to reduce environmental impact, provided that their limitations are considered.Item 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 GabrielaBecause 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.