Browsing by Author "Freire Herrera, Genesis Janeth"

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Comparación de hormigones elaborados con dosificación de 210 kg/cm2 con y sin adición de ceniza de cáscara de huevo
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2025-02) Freire Herrera, Genesis Janeth; Bayas Altamirano, Myriam Marisol
Agro-industrial waste is a worldwide problem today due to the large amount of waste generated and its poor final disposal. The following experimental work dealt with the production of concrete with a dosage of 210 kilograms per square centimeter, with and without the addition of eggshell ash. To do this, eggshells were collected for a month, which were dried, ground and calcined. Once the ash was obtained, a detailed characterization of all the materials involved in the dosage was carried out using the Optimum Density Method, including moisture content, density, granulometry and absorption. With this information, concrete mixtures were designed with different percentages of fine aggregate replacement by eggshell ash (5, 15 and 30 percent). Once the compressive strength tests were carried out, they revealed a differentiated behavior depending on the curing age and the proportion of eggshell ash incorporated. Initially, at 7 days, a 5.23 percent increase in compressive strength was observed with a 5 percent ash substitution, suggesting that a low concentration of this material can enhance the early development of concrete strength. However, the formulations with higher ash additions (15 and 30 percent) did not exhibit this initial improvement, showing a decrease of 13.81 and 22.82 percent, respectively. Subsequently, at 14 days, the samples with 5 and 30 percent additions experienced a 12.03 and 20.99 percent reduction in strength compared to the standard sample. In contrast, the specimens with a 15 percent inclusion did not show a significant decline, remaining within the target range for a 210 kilograms per square centimeter concrete. Finally, the compressive strength test applied at 28 days of age revealed that the specimens with a 15 percent replacement showed a notable increase of 13.96 percent in strength compared to the standard sample. In contrast, the specimens with a 5 percent replacement showed a strength that remained within the target range, indicating that this proportion does not negatively affect strength, although it does not generate a significant increase either. However, the 30 percent replacement was counterproductive, showing a 24.58 percent decrease in strength. These results demonstrate the potential of eggshell ash as a partial substitute to improve the properties of concrete and encourage continued research and promotion of eco-sustainable practices in the construction industry.