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ROSSI, B. F. (2018). A Study of recovered asphalt binders with the purpose of adjusting the simulated short-term aging procedure (Master of Civil Engineering) – Department of Transportation Engineering, São Carlos School of Engineering, University of São Paulo, São Carlos, SP. Brazil. The Rolling Thin Film Oven Test has been used for more than 50 years in the simulation of the short-term aging of asphalt binders, and the continuity of its validity is totally conditioned to the verification of its equivalence to real aging. The aim of this research is to compare the rheological properties of real short-term aged binders recovered with the properties of binders submitted to the RTFOT. For this purpose, the experiment was divided into two stages. The first one involved the calibration of the residual perchlorethylene evaporation method from samples of seven different asphalt binders, given that any binder recovery process involves the use of solvents. The second step focused on the recovery of samples of the same types of asphalt binders that underwent real short-term aging through the use of the machine Infratest Asphaltanalysator, applying the evaporation method calibrated in step 1 to these recovered samples and then subjecting them to MSCR tests at two temperatures, master curves tests and rotational viscosity tests, and comparing their results with those of same source samples, but aged at different times in RTFOT, making it possible to estimate an equivalent aging time for each one of the seven recovered samples. Also, the extracted samples have passed by FTIR analysis, in order to verify the success of the residual solvent elimination process. In the end, it was possible to verify that all samples recovered had a higher level of aging than the equivalent samples aged in the laboratory, which indicates that RTFOT currently underestimates the real effect of short-term aging in asphalt binders.

Estudo de ligantes asfálticos recuperados com vistas à adequação do procedimento de simulação do envelhecimento a curto prazo