Ingeniería Civil y Mecánica

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Start date: 2022Subject: search.filters.subject.DOSIFICACIÓN DE HORMIGÓN

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    Desarrollo de un software para el diseño de dosificaciones de hormigón en base al método ACI y densidad óptima
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil., 2025-02) Velastegui Solis, Valeria Nayelly; Pico Núñez, María Fernanda
    Concrete, being a very versatile and durable material, has become essential in modern construction, generating a high dependence on this component both in the Ecuadorian industry and worldwide. Statistics show a constant growth in its consumption in Ecuador, which underlines the importance of ensuring an adequate design of the mixtures. Therefore, in our environment the most used methods for dosing are the Optimum Density method, developed by the Central University of Ecuador and the ACI method, of international nature. For this reason, this project was based on the development of a software that integrates these two methods for the design of concrete mixtures, which has been developed through execution in three phases. In the first phase, the bibliographic review on the ACI and Optimum Density methods was carried out, laying the theoretical foundations of the software. In the second phase, the code and an intuitive graphical interface were implemented, shaping the application. Finally, in the third phase, several tests were carried out to verify the efficiency and precision of the software. In this way, the final product was called "Hormigón Maestro" and it is an application that was validated by comparing its results with manual calculations and experimental data available in freely accessible repositories, obtaining an error of less than two percent, which demonstrates its high reliability. In short, this tool is capable of streamlining the concrete mix design process and ensures the accuracy of the results, becoming a valuable resource for civil engineering professionals and students because it optimizes calculation time, provides a dosage expressed in weight and volume, as well as offering templates and guides to facilitate the use of the program.
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    Estudio de la resistencia a compresión del hormigón simple con reemplazo parcial de puzolanas obtenida de la calcinación de rastrojo de maíz
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-02) Núñez Arellano, Wilson Mauricio; Ureña Aguirre, Maritza Elizabeth
    In the present experimental work, the reduction of cement is investigated since it produces CO2 emanation in manufacturing, taking as an alternative a partial replacement with corn stover ashes for the production of simple concrete, with the purpose of increasing the resistance and thus reducing pollution. The corn stover was calcined at controlled temperatures between 500 to 750 degrees Celsius, the ash was obtained, the tests were carried out to know the physical and mechanical properties of the aggregates, corn stover ash and cement, using NTE INEN standards. It was shown that the materials were optimal, then the dosage was calculated for simple concrete and with 6, 8, 10 and 12 percent ash. 12 test tubes were made for each dosage for time intervals of 7, 14 and 28 days, giving us a total of 60 test tubes. The compression tests of the previously selected specimens were continued at 7, 14 and 28 days of curing. The concrete specimens with 6 percent ash presented positive results at 28 days as they reached a resistance of 256.77 Kg/cm2, which exceeds the resistance obtained from simple concrete of 246.00 Kg/cm2, in contrast, the resistance of 8, 10 and 12 percent with values of 210.93, 207.27, 206.89 Kg/cm2 respectively, had a significant decrease, these values do not reach the limit lower design resistance of 228 Kg/cm2. Finally, it was shown that the greater the amount of ash, the lower the strength of the concrete.
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    Análisis y evaluación de datos para dosificación de mezclas de hormigón mediante el desarrollo de un software en lenguaje de programación Python aplicando el método ACI
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2022-07) Rodríguez Auquillas, William Alejandro; Portilla Yandún, Favio Paúl
    In this experimental work, it was performed the coding and creation of a graphical interface of a software in Python, for concrete mixtures proportioning, applying the ACI method. The software allows you to quickly obtain dosages by entering physical properties data of cement, fine aggregate, coarse aggregate and design generalities. Through laboratory tests were determined the physical properties of these materials such as: density, fineness modulus, granulometry, absorption capacity and moisture content. The software construction, it was made through the analysis of ACI 211.1 and ACI 318-11 standards, that specify the operations to follow for the concrete mixtures proportioning. Once the calculation methods were established, it was developed the software programming code and the creation of the graphical interface. In order to verify the correct execution of the software, the values obtained of the materials properties were entered in the program, and concrete proportions were generated for compression resistances of 180, 210 and 240 kilograms over square centimeters. With the materials proportions obtained in the program, 9 test samples were made for each design resistance, giving a total of 27 specimens that were tested at 7, 14 and 28 days. After determining compression resistances at 28 days, the following results were obtained: 187, 215.67 and 244.33 kilograms over square centimeters, by concluding that the amounts obtained of each proportioning from the program are truthful and this one can be used for concrete mixtures proportioning.