Monitoring of corrosion processes in chloride contaminated mortar by X-ray tomography
Abstract
La corrosión del acero reforzado en concreto expuesto aambientes que contienen cloruro es un serio problema en la
práctica de la ingeniería civil. Los métodos electroquímicos,
vale decir, el mapeo potencial, suministra información acerca
de si el refuerzo todavía es pasivo o se ha iniciado la
despasivización. La aplicación de tales técnicas no suministra información sobre el tipo de corrosión, ni sobre la extensión y distribución del producto de la corrosión. Hasta hoy es imposible recopilar tal información sin destruir los
especímenes, luego de que la prueba electroquímica se lleva a cabo. Para superar este problema se trató de estudiar la superficie del acero dentro del mortero de los especímenes,mediante las tomografías con Rayos X (CT). En el marco de estas investigaciones se pudo mostrar, por primera vez, que la tomografía de rayos X es apropiada para hacer visible la corrosión de las barras de refuerzo empotradas en el mortero,con un recubrimiento de unos 20 milímetros. Posteriormente,secciones de las varillas empotradas formadas por las medidas del CT, fueron exitosamente comparadas con las secciones metalográficas.
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