Abstract
The aggregates play an important role in the concrete, both qualitatively as well as quantitatively. The quality of aggregates not only limits the strength of concrete but it greatly effects the durability and structural performance of concrete. The strength of concrete not only depends upon the mechanical strength of aggregates but also to a greater extent on its absorption, modulus of elasticity, shape and size, bulk density, porosity, moisture-content, fineness modulus, grading of aggregates etc. Some of these parameters have been studied by remote sensing techniques, since the traditional methods, for finding out these properties involve, much time, labour and money. The radiance levels or signatures are sensitive to changes in aggregates parameters like shape and size, grading of aggregates (both coarse and fine) and moisture content. The absolute radiance or signature of the images, are correlated with these parameters, using different filters.
Résumé
Les granulats sont un élément essentiel du béton, à la fois qualitativement et quantitativement. La qualité des granulats ne conditionne pas seulement la résistance du béton, mais aussi sa durabilité et ses performances dans les structures. La résistance du béton ne dépend pas seulement de la résistance mécanique des granulats mais encore plus de leur module d'élasticité, de leur forme et angularité, de leur poids spécifique, porosité, teneur en eau, du module de finesse, etc … Certains de ces paramètres ont été étudiés par le biais des spectres de rayonnement, car les méthodes traditionnelles d'essais coûtent dans certains cas beaucoup de temps, de travail et d'argent. Les niveaux de rayonnement sont sensibles aux modifications de certains paramètres tels que la forme, la taille, la courbe granulométrique et la teneur en eau. Des corrélations sont faites, avec utilisation de filtres variés.
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Mehta, H.S., Agrawal, M.N. Aggregates properties in relation to absolute radiances. Bulletin of the International Association of Engineering Geology 33, 67–71 (1986). https://doi.org/10.1007/BF02594707
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DOI: https://doi.org/10.1007/BF02594707