Tagging and identifying asphalt additives

G - Physics – 01 – N

Patent

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Details

G01N 33/42 (2006.01) C04B 40/00 (2006.01) C08L 95/00 (2006.01) G01N 31/22 (2006.01)

Patent

CA 2114896

A tag is added to an asphalt additive, typically an anti-stripping agent. The tag is mixed with other components of an asphalt composition and melt processed at 300°F (149°C) or above to produce an asphalt composition. Presence of the tag to identify presence of the additive is performed by dissolving the asphalt portion of the composition in a water-immiscible solvent and then extracting the tag in an acidic aqueous solution and developing a color with a diazo compound.

Un marqueur est ajouté à un additif pour asphalte, à une dope d'adhésivité, par exemple. Le marqueur est incorporé aux autres ingrédients entrant dans la composition et soumis à un traitement à chaud à une température de 300 degrés F (149 degrés C) ou plus pour la production de la composition d'asphalte. La présence du marqueur confirmant l'utilisation de l'additif en cause est démontrée par dissolution de la portion d'asphalte dans un solvant non miscible dans l'eau, suivie de l'extraction du marqueur dans une solution aqueuse acidifiante et du développement d'une couleur à l'aide d'un composé diazoïque.

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