Influencia del medio ambiente de Guayaquil en la corrición de estructuras de hormigón armado preparadas con cemento puzolanico
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Comisión Nacional de Energía Atómica. Gerencia Área Académica. Gerencia Instituto Sabato
Universidad Nacional San Martin. Instituto de tecnología Sabato
Universidad Nacional San Martin. Instituto de tecnología Sabato
Resumen
En este trabajo se estudia el comportamiento de hormigones armados elaborados con cemento puzolánico y la protección que estas mezclas proveen al acero de refuerzo. El cemento puzolánico es de uso común en las construcciones en el Ecuador. El país posee una orografía que permite estimar la existencia de grandes reservas de materiales puzolánicos derivados de volcanes extintos. Se elaboraron probetas cúbicas de hormigón con barras de acero embebidas para realizar ensayos electroquímicos y obtener parámetros como: resistividad eléctrica del hormigón y del acero, potencial de corrosión y resistencia a la polarización del acero; realizándose mediciones periódicas por aproximadamente 400 días. Además, se elaboraron probetas cilíndricas para ensayos de difusión de iones cloruro y de dióxido de carbono en la matriz de hormigón. Los resultados de los ensayos se comparan con resultados obtenidos en investigaciones similares y con los rangos aceptados para los diferentes parámetros analizados, aunque múltiples factores pueden influir en el comportamiento del hormigón armado. Con estos resultados y en base al modelo de vida útil de Tuuti, se analiza el comportamiento que presentarían construcciones realizadas con estas mezclas.
In this work, the behavior of reinforced concrete made with pozzolanic cement and the protection that these mixtures provide to the reinforcing steel are studied. Pozzolanic cement is commonly used in construction in Ecuador. The country has an orography that allows estimating the existence of large reserves of pozzolanic materials derived from extinct volcanoes. Cubic concrete specimens were made with embedded steel bars to carry out electrochemical tests and obtain parameters such as: electrical resistivity of the concrete and steel, corrosion potential and resistance to polarization of the steel; performing periodic measurements for approximately 400 days. In addition, cylindrical specimens were made for diffusion tests of chloride ions and carbon dioxide in the concrete matrix. The test results are compared with results obtained in similar investigations and with the accepted ranges for the different parameters analyzed, although multiple factors can influence the behavior of the reinforced concrete. With these results and based on the Tuuti useful life model, the behavior that constructions made with these mixtures would present is analyzed.
In this work, the behavior of reinforced concrete made with pozzolanic cement and the protection that these mixtures provide to the reinforcing steel are studied. Pozzolanic cement is commonly used in construction in Ecuador. The country has an orography that allows estimating the existence of large reserves of pozzolanic materials derived from extinct volcanoes. Cubic concrete specimens were made with embedded steel bars to carry out electrochemical tests and obtain parameters such as: electrical resistivity of the concrete and steel, corrosion potential and resistance to polarization of the steel; performing periodic measurements for approximately 400 days. In addition, cylindrical specimens were made for diffusion tests of chloride ions and carbon dioxide in the concrete matrix. The test results are compared with results obtained in similar investigations and with the accepted ranges for the different parameters analyzed, although multiple factors can influence the behavior of the reinforced concrete. With these results and based on the Tuuti useful life model, the behavior that constructions made with these mixtures would present is analyzed.