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X-ray computed tomography and aggregate image system (AIMS) for studying hot mix asphalt and aggregates
Tomografía computarizada con rayos-x y sistema de imágenes de agregados (AIMS) para el estudio de mezclas asfálticas y agregados
DOI:
https://doi.org/10.15446/ing.investig.v28n2.14903Keywords:
materials characterisation, X-ray computed tomography, aggregate imaging system, asphalt mixture, aggre-gate, pavement (en)caracterización de materiales, tomografía computarizada con rayos X, sistema de imágenes de agregados, mezcla asfáltica, agregados, pavimentos (es)
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Achieving reliable pavement design, durable roadway structures and effective maintenance and rehabilitation plans requires the suitable characterisation of the materials used in pavement construction. This paper describes two nondestructive techniques based on image acquisition and analysis and their successful application in pavement engineering: X-ray computed tomography (X-ray CT) and aggregate imaging system (AIMS). The former has been used for characterising the internal structure of asphalt mixes to analyse and model their performance; it has been particularly used for studying the content, size, distribution and connectivity of air-voids and these variables’ relationship with moisture damage susceptibility, capillarity and permeability within the mixes. AIMS was intended for characterising aggregates’ morphological properties (i.e., form, angularity and texture). This technique provides important advantages regarding the standard methods used for obtaining the same aggregate properties: it is objective, reliable, reproducible and can be carried out quickly. This paper was aimed at describing these two techniques’ theoretical backgrounds, mention some recent applications and provide insight into how existing characterisation of materials used in pavement construction can be improved.
La caracterización de las propiedades de los materiales empleados en ingeniería de pavimentos es fundamental para garantizar diseños confiables, estructuras durables y planes de mantenimiento y rehabilitación efectivos. Este artículo describe dos técnicas no destructivas basadas en la toma y procesamiento de imágenes que han sido exitosamente empleadas para caracterizar materiales de pavimentos: 1) tomografía computarizada con rayos-X, y 2) Sistema de Imágenes de Agregados. La primera técnica permite caracterizar la estructura interna de mezclas asfálticas con el fin de analizar y modelar su desempeño. En particular, esta técnica ha permitido estudiar el contenido, tamaño, distribución y conectividad de los vacíos y la relación de estas variables con la susceptibilidad al deterioro por la presencia de humedad, la capilaridad y la permeabilidad de las mezclas. El Sistema de Imágenes de Agregados fue desarrollado para caracterizar las propiedades morfológicas de los agregados (i.e., forma, angularidad y textura), técnica que proporciona importantes ventajas con respecto a los ensayos estándar ya que las mediciones son objetivas, de rápida ejecución, repetibles y reproducibles. El objetivo de este documento es describir los aspectos teóricos básicos y algunas aplicaciones recientes de estas técnicas que representan nuevas herramientas para mejorar los procesos de caracterización de los materiales empleados en ingeniería de pavimentos.
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Copyright (c) 2008 Allex E. Álvarez Lugo, Edith Arámbula Mercado, Silvia Caro Spinel
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