Evaluación de la acción del fuego en una estructura de hormigón armado mediante XRD, SEM y EspectroscopÃa infrarroja
Abstract
RESUMEN
El Monumento a los Héroes de la Independencia situado en Humahuaca (norte de Argentina) es una obra inaugurada en 1950 que representa magnÃficamente las razas autóctonas y europeas que conforman la identidad nacional. Las esculturas de bronce de 40t se encuentran sustentadas por una estructura de hormigón armado, la cual incluye instalaciones adecuadas para vivienda de un cuidador. El subsuelo de esta vivienda sufrió la acción de un incendio cuya carga y tiempo de duración se desconocen. A fin de evaluar los efectos en el hormigón producidos por el fuego, fueron tomadas muestras de un sector de la estructura que luego fueron analizadas por diversas técnicas: difracción por rayos X, microscopÃa electrónica de barrido y espectroscopia infrarroja. El estudio permitió inferir la temperatura a la que estuvieron sometidas las muestras analizadas y la profundidad alcanzada por el daño. Se proponen los pasos a seguir para evaluar la totalidad de la estructura.
Palabras Clave: hormigón armado; fuego; microscopÃa electrónica; difracción por rayos X; espectroscopia infrarroja.
ABSTRACT
The Monument to the Independence Heroes in Humahuaca (northern Argentina) was built in 1950 and represents magnificently the native and European people which shape the national identity. A reinforced concrete structure bears the bronze sculptures of 40tons and includes a dwelling for the monument keeper. The basement of this dwelling underwent a fire whose load and duration are unknown. A few samples from a sector of the structure were taken in order to assess the effects that fire produced in the concrete. They were analyzed by different techniques: X-ray diffraction, scanning electron microscopy and infrared spectroscopy. The study allowed to infer the temperature experimented by the analyzed samples and the depth of the damage. The following steps to assess the whole structure are proposed.
Keywords: reinforced concrete; fire; electronic microscopy; X-ray diffraction; infrared spectroscopy.
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References
Gea S., Suárez O., Boso M., Chacón P. (2010), Estudios preliminares para la puesta en valor del Monumento a los Héroes de la Independencia de Humahuaca (Jujuy, Argentina), en el VI Congreso Internacional Sobre PatologÃa y Recuperación de Estructuras (Libro de resúmenes ISBN 978-987-25855-2-5)
Handoo S.K., Agarwal S., Agarwal S.K. (2002) Physicochemical, mineralogical and morphological characteristics of concrete exposed to elevated temperatures, Cement and Concrete Research, v. 32, pp. 1009-1018.
Sidney D., (1972) Identification of hydrated cement constituents using a scanning electron microscope-energy dispersive X-ray spectrometer combination, Cement and Concrete Research 2 (5) pp. 617-632.
Tam V. W. Y., Gao X.F., Tam C.M, (1972), Carbonation around near aggregate regions of old hardened concrete cement paste, Cement and Concrete Research v. 35, pp. 1180-1186.
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