Browsing by Author "Ulcuango Valverde, Marlon Richard"

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    Análisis del módulo de elasticidad del hormigón estructural en base a su resistencia a la compresión, fabricado con materiales primarios de las minas guayusa y Panamá, en el sector del río Upano, cantón Morona, provincia de Morona Santiago.
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2025-02) Ulcuango Valverde, Marlon Richard; Núñez Aldaz, Galo Wilfrido
    Concrete is a material widely used in structural processes, mainly due to its ability to adapt to different shapes, thanks to its plastic state in fresh condition, which facilitates its molding into various sizes. One of the properties of concrete is its Static Modulus of Elasticity, which quantifies the stiffness of the material and its resistance to axial deformations. Since coarse and fine aggregates make up the largest percentage of the mix, it is essential to study their physical and mechanical properties. This analysis allows a precise understanding of the behavior of concrete as an efficient structural material. The development of this experimental work began with the collection of aggregate samples from two mines, and their reduction to test size. Subsequently, aggregate characterization studies were carried out to evaluate their application in structural concrete, and the actual density of the cement was determined. Based on these results, we proceeded to the design of mixtures, establishing the dosage for concretes with compressive strengths of 21 and 28 MPa, using the optimum density method. A single dosage was used, since the initial tests achieved the expected strengths. In total, 84 concrete specimens were tested, performing both fresh and hardened evaluations. Tests in the fresh state included: sampling, density, air content, yield and slump. In the hardened state, compressive strengths were determined at ages 7, 14, 21 and 28 days, allowing the drawing of age vs. compressive strength and stress vs. strain curves for structural concrete. Finally, the Modulus of Static Elasticity (MEE) of the concrete was calculated according to ASTM C469. From these results, specific constants are proposed for local adaptation of the aggregates, depending on the origin of the materials and the equation used, which are detailed in this experimental wor.