Análisis de la relación entre la curva de retención de agua, distribución de tamaño de partículas y de poros en la caracterización de una arcilla porosa colapsable
Analysis of the relationship between the water retention curve, particle size and pore size distribution in the characterization of a collapsible porous clay
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En suelos altamente porosos con susceptibilidad de colapso, existen puntos de variabilidad volumétrica, debido a la heterogeneidad presente, en cuanto a los diámetros de las gargantas porales. La predominancia de un tamaño de poro está estrechamente relacionada con ciertos valores de la curva de retención de agua (WRC). No obstante, a la fecha no se ha estudiado una posible correlación con la distribución del tamaño de partículas (PaSD), obtenida mediante métodos modernos de sedimentación gravitacional de alta confiabilidad. La arcilla porosa de origen laterítico bajo estudio, fue caracterizada mediante ensayos índice para conocer su comportamiento geotécnico básico. Posteriormente, fue analizada mediante ensayos de porosimetría por intrusión de mercurio para la estimación de la distribución del tamaño de poros PSD; método del papel filtro y placa de presión para la obtención de la curva de retención de agua; así como el método de medición integral de la presión en la suspensión (ISP), para obtener la granulometría fina del material. Este artículo pretende presentar una propuesta de relación entre estos parámetros, con el objetivo de mejorar el entendimiento en la caracterización de este tipo de materiales. Los resultados mostraron que efectivamente existe una relación fuerte entre las distribuciones de tamaño de partícula, poros y la curva de retención de agua. Principalmente, esto se ve reflejado en los lugares geométricos correspondientes a las entradas de valor de aire (AEV) de macroporos y microporos. Las cuales coinciden con parámetros esenciales del comportamiento de las demás curvas (PaSD y PSD).
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