Resumen

LIMETA-DIONET, Esbeydi Janet; DELGADO-ALAMILLA, Horacio  y  LOPEZ-LARA, Teresa. Calibration and verification of the recovery of an asphalt binder in trichloroethylene by means of the rotavapor. Ing. invest. y tecnol. [online]. 2023, vol.24, n.4, 1788.  Epub 28-Nov-2023. ISSN 2594-0732.  https://doi.org/10.22201/fi.25940732e.2023.24.4.032.

The present work evaluates the extraction temperatures by the Rotavapor method, with the objective of finding the optimal extraction temperature to minimize heat hardening and maximize solvent recovery in the asphalt binder. To check the impact caused by the temperature on the asphalt binder, the Dynamic Shear Rheometer (DSR) was used, where the performance was measured with the parameter G*/sen δ, likewise the deformation was evaluated with the Repeat Creep Elastic Recovery Test (MSCR). It is worth mentioning that the specific regulation that the evaluation must be done with asphalt produced by RTFO, but for research purposes it was done as in the original condition. The study consists of three stages: in the first stage the "Test Calibration" was done to determine a procedure that would ensure the reproducibility of the measurements without affecting the characteristics of the evaluated binder, 10 and 30 g portions of an unmodified asphalt binder were taken, which were dissolved in trichlorethylene, to later make the recoveries in the Rotavapor at temperatures of 110 and 140 °C. Based on the results obtained, the second stage was followed, which consisted of verifying if the established condition was valid for any type of binder. Finally, a mixture was produced with the two types of asphalt binder evaluated in the previous stages. The results obtained show that the optimum extraction temperature is 140 °C, however, it is recommended to extend the investigation with chemical tests, to determine a procedure for modified binders, since with the results obtained in the MSCR test, there were variations of up to 234.4 %. It was also concluded that the RTFO test ages the asphalt binder more than the mixing and compaction done in the laboratory for the fabrication of specimens.

Palabras llave : RAP; rotavapor; trichloroethylene; asphalt binder; DSR.

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