Browsing by Author "Núñez Núñez Joel Sebastián"

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    Caracterización del comportamiento frente al fuego de tres tipos de suelos provenientes de las parroquias Pomona, Tarqui, Diez de Agosto del cantón Pastaza de la provincia de Pastaza utilizados en obras civiles
    (Ingeniería Civil y Mecánica. Carrera Ingeniería Civil, 2025) Núñez Núñez Joel Sebastián; Pérez Maldonado Ruth Lorena
    Civil engineering increasingly faces challenges related to soil behavior under extreme conditions, particularly direct exposure to fire. In Pastaza Province, an Amazonian region of Ecuador where soils are widely used in civil works under MTOP guidelines, there is a notable lack of studies analyzing the effects of thermal exposure on geotechnical properties. This knowledge gap hinders the development of appropriate design criteria for wildfire scenarios— an issue exacerbated by the growing frequency of such events due to climate change and anthropogenic activities. The primary objective of this research was to characterize the fireinduced behavior of three soil types from the parishes of Pomona, Tarqui, and Diez de Agosto, located in the Pastaza canton. The study examined physical and mechanical properties before and after exposure to 750°C, including an assessment of soil flammability. The experimental work was conducted in accordance with AASHTO, ASTM, and NTE INEN standards to ensure accuracy and reproducibility. The methodology was structured into three complementary phases: physical characterization through grain size distribution, specific gravity, Atterberg limits, and permeability tests; followed by mechanical property evaluation using Proctor and CBR tests. Soil samples were subjected to controlled thermal treatment at 750°C to simulate fire exposure, with comparative analyses conducted between natural and post-thermal states. The results revealed significant transformations in the physical and mechanical properties of the tested soils. Exposure to 750°C caused notable mass loss, volumetric changes, and alterations in bulk density and porosity. Pomona exhibited the greatest granulometric variability, with a 5.17% decrease in sand content and a 3.32% increase in fines, along with the highest plasticity index increase 88.89%. Tarqui showed the most significant change in specific gravity, rising by 5.65% to 2.854, and the greatest reduction in bearing capacity, with CBR values dropping by 34.73%. Diez de Agosto recorded the lowest permeability at 1.98E-5 cm/s, which further decreased after thermal exposure. These findings confirm that fire exposure induces drastic changes that compromise geotechnical performance, underscoring the critical importance of integrating these effects into infrastructure design and preventive strategies in fire-prone regions