Unidad de Posgrado Civil y Mecánica

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    Análisis de la sustitución del material acero A36 por el material Q 235B en la construcción del sistema de agua potable de la ciudad de Riobamba provincia de Chimborazo
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Mecánica Mención Diseño, 2019) Amancha Torres, Israel Jacinto; Espín Lagos, Segundo Manuel
    The present research “The analysis of steel A36 substitution instead of Q235B material for the construction of the Drinking Water System in Riobamba city, Chimborazo province.”, is primarily aimed at comparing the Q235B material with A36 steel. Moreover, the obtained data, is the perfect sample to analyze the variable which supports the comparison between both materials, verifying that the results for the substitution bear out firmly all the characteristics of the proposal for this Project, the data obtained from the tests provided belong to the Consorcio Alao company having the authorization of the data, in addition tests were carried out in the Center of Productive Metalmechanical Development Carrocero. The information collected on the destructive and non-destructive testing methods helped us to analyze the physical-chemical and mechanical properties of this steel. In this way, each of the characteristics of this material is determined to be used in the construction of the Drinking Water System in Riobamba city, Chimborazo province. At the end of the project, the characterization of the analyzed steels and their replacement for the construction of the Drinking Water System of Riobamba city in Chimborazo province is presented, through the SMAW welding process under the criteria of acceptance and rejection of API standards 1104 and ASME IX, using electrodes E6010 and E7018 ones as input material, with a type of butt joint and 6G welding position because the pipe to be welded is static without being able to change Welding position, material Q235B presents good mechanical properties and its welding bead does not present many defects.
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    Análisis del comportamiento mecánico del acero estructural ASTM A36 r recubierto con materiales ignífugos luego que han sido sometidos a altas temperaturas.
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Ingeniería Civil con Mención en Estructuras Metálicas., 2025) Núñez Acosta Ivonne Alexandra; Guamanquispe Toasa Patricio
    In Ecuador, ASTM A36 steel is widely used in metal structures due to its strength and ductility, although it loses mechanical properties at elevated temperatures, such as during fire exposure. While intumescent coatings are employed as passive protection, there is limited local research on their effectiveness on this type of steel, representing a critical gap in structural safety. This study followed ISO 12944 and E119-24 standards to define the requirements for thermal testing. An experimental methodology was developed, preceded by documentary and patent research to identify fireproof coatings available in the country. Three different formulations were applied to ASTM A36 steel specimens, which were then subjected to temperatures of 600 °C, 800 °C, and 1000 °C for intervals of 3, 4, and 5 minutes. Metallographic, hardness, and tensile tests were conducted, and results were compared to a control sample with no coating or thermal exposure. The bestperforming coating underwent further testing at extended exposure times of 30, 45, and 60 minutes. The results indicate that the most representative formulations belong to DEKORUM INQUIFESA, with the X-50 coating standing out. This formulation exhibited minimal variation in carbon content (0.26–0.29%), low Brinell hardness loss (minimum 139.5 HB), and yield strength variations ranging only from 1% to 9%. In fire simulation tests, X-50 outperformed uncoated steel, showing up to 69% improvement in tensile strength. However, after 30 minutes of continuous hightemperature exposure, the coating’s effectiveness decreased, suggesting the need for complementary active protection systems to prevent structural failure.