CONCENTRACIÓN DE IONES CLORUROS EN EL HORMIGÓN ARMADO EXPUESTO A DIFERENTES CONDICIONES Y MEDIOS DE EXPOSICIÓN EN CUBA.

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Bibliographic Details
Title:	CONCENTRACIÓN DE IONES CLORUROS EN EL HORMIGÓN ARMADO EXPUESTO A DIFERENTES CONDICIONES Y MEDIOS DE EXPOSICIÓN EN CUBA.
Alternate Title:	CHLORIDE ION CONCENTRATION IN REINFORCED CONCRETE EXPOSED TO DIFFERENT MEDIUMS AND EXPOSURE CONDITIONS IN CUBA.
Authors:	Castañeda Valdés, Abel¹, Hernández Oroza, Alberto² alberto@diagnosticos.proyectos.ohc.cu
Source:	Revista CENIC Ciencias Quimicas. 2024, Vol. 55, p162-178. 17p.
Subjects:	CONCRETE construction, REINFORCED concrete, REINFORCING bars, CHLORIDE ions, CONCRETE corrosion, DETERIORATION of concrete
Abstract (English):	In order to demonstrated the behavior of the chloride concentration from the surface to different depths, in building elements of the three structures and in reinforced concrete probes, exposed to different condition and means of exposure in Havana City, Cuba, a study was carried out. From a comparison between the concentration of soluble and bound chloride ions, it was demonstrated that the concrete used in the building elements in two structures could be casted with sand and seawater as a mixture. Necessary and sufficient condition, so that no apparent diffusive behavior of chloride occurs, taking into account the condition and the natural environment of exposure. The phenomena of efflorescence and carbonation at certain coating thicknesses and on the surface also influenced the non-occurrence of apparent diffusion behavior in the entire concrete mass of concrete exposed to the interior exposure condition under the vent ilated shelter effect. It was confirmed that a moderate quality reinforced concrete, casted with sand and seawater, can be used in the building of piles that support the reinforced earthenware in a bay, as long as it is exposed to the immersion exposure condition total in seawater, and without significant tidal zones and splashed. It was demonstrated, confirmed with visual observation, that high concentration of chloride ions resulted in a necessary but no sufficient condition in the origin and development of the corrosion phenomenon in reinforcement steel, as long as, the concrete is exposed to the immersion exposure condition total of seawater. In case the concrete was not casted with sand and seawater, an apparent diffusive behavior was demonstrated in a structural element of another of the selected structures, as well as in reinforced concrete probes, causing a very early deterioration over time, due to atmospheric corrosion of reinforcement steel, in the presence of very high corrosivity categories of the atmospheres, simulated or not, confirmed with visual observation on the probes. [ABSTRACT FROM AUTHOR]
Abstract (Spanish):	Se realizó un estudio con el propósito de demostrar el comportamiento de la concentración de cloruros desde la superficie hasta diferentes profundidades, en elementos estructurales de tres estructuras y en probetas de hormigón armado expuestos a diferentes condiciones y medios de exposición en la Habana, Cuba. A partir de una comparación entre las concentraciones de iones cloruro solubles y enlazados se demostró, que el hormigón armado usado en los elementos estructurales en dos estructuras, pudo ser elaborado usando arena y/o agua de mar como de amasado. Condición necesaria y suficiente, para que no ocurriera un comportamiento difusivo aparente de cloruros, teniendo en cuenta la condición y el medio natural de exposición. Los fenómenos de la eflorescencia y la carbonatación a ciertos espesores de recubrimiento y en la superficie, influyeron también en la no ocurrencia de un comportamiento difusivo aparente en toda la masa de hormigón expuesto a la condición de exposición al interior bajo el efecto de abrigo ventilado. Se confirmó, que un hormigón armado de moderada calidad, elaborado con arena y/o agua de mar, puede ser usado en la construcción de pilotes que sostienen la loza armada en una bahía, siempre y cuando esté expuesto a la condición de exposición de inmersión total en el agua de mar, y sin zonas de marea y salpicaduras significativas. Se demostró, confirmado con la observación visual, que concentraciones elevadas de iones cloruro, resultaron en una condición necesaria pero no suficiente en el origen y desarrollo del fenómeno de la corrosión en los aceros de refuerzo, siempre y cuando el hormigón armado este expuesto a la condición de exposición de inmersión total en el agua de mar. En caso de que el hormigón no fuera elaborado con arena y/o agua de mar, un comportamiento difusivo aparente fue demostrado en un elemento estructural de otra de las estructuras seleccionadas, así como en probetas de hormigón armado, causando un deterioro muy anticipado en el tiempo, debido a la corrosión atmosférica del acero de refuerzo, ante categorías muy elevadas de agresividad corrosiva de la atmósfera simuladas o no, confirmado con la observación visual de las probetas. [ABSTRACT FROM AUTHOR]
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Database:	MedicLatina

Description
Abstract:	In order to demonstrated the behavior of the chloride concentration from the surface to different depths, in building elements of the three structures and in reinforced concrete probes, exposed to different condition and means of exposure in Havana City, Cuba, a study was carried out. From a comparison between the concentration of soluble and bound chloride ions, it was demonstrated that the concrete used in the building elements in two structures could be casted with sand and seawater as a mixture. Necessary and sufficient condition, so that no apparent diffusive behavior of chloride occurs, taking into account the condition and the natural environment of exposure. The phenomena of efflorescence and carbonation at certain coating thicknesses and on the surface also influenced the non-occurrence of apparent diffusion behavior in the entire concrete mass of concrete exposed to the interior exposure condition under the vent ilated shelter effect. It was confirmed that a moderate quality reinforced concrete, casted with sand and seawater, can be used in the building of piles that support the reinforced earthenware in a bay, as long as it is exposed to the immersion exposure condition total in seawater, and without significant tidal zones and splashed. It was demonstrated, confirmed with visual observation, that high concentration of chloride ions resulted in a necessary but no sufficient condition in the origin and development of the corrosion phenomenon in reinforcement steel, as long as, the concrete is exposed to the immersion exposure condition total of seawater. In case the concrete was not casted with sand and seawater, an apparent diffusive behavior was demonstrated in a structural element of another of the selected structures, as well as in reinforced concrete probes, causing a very early deterioration over time, due to atmospheric corrosion of reinforcement steel, in the presence of very high corrosivity categories of the atmospheres, simulated or not, confirmed with visual observation on the probes. [ABSTRACT FROM AUTHOR]
ISSN:	10158553