Reclaimed Asphalt Pavement (RAP) is commonly used to reduce the cost of pavement construction, preserve non-renewable natural resources and reduce the global impact on the environment. Nevertheless, obtaining the properties of the aged and oxidized RAP binder remains challenging. The current extraction and recovery procedure is affected by unclear effects on the binder properties due to the solvent action. Therefore, the implementation of a novel and practical procedure for estimating the properties of RAP binder without altering the material behavior is very much needed. This research effort investigates the possibility of developing a simple analysis method to estimate the high-Temperature properties of RAP binder without extraction or chemical treatments. The proposed procedure makes use of Dynamic Shear Rheometer (DSR) tests on asphalt mortars, composed by fresh binder and RAP material passing sieve #100. The modified Nielsen model and the Voigt model are then used to back-calculate RAP binder properties. Once the master curve of the complex modulus and of the phase angle of the RAP binder are backcalculated from binder and mortars properties, the Superpave parameter G∗/sinδ can be evaluated. Therefore, the amount of RAP binder which is allowed without changing the high temperature performance grade (PG) can be estimated by interpolation. Then, based on blending chart, fresh binder PG corresponding to a specific RAP binder amount can be obtained without exceeding the prescribed permanent deformation threshold. The final procedure developed was verified through DSR tests, and its capability of capturing the high temperature properties of RAP binder was demonstrated.

Estimation of the high temperature properties of reclaimed asphalt pavement binder without extraction

Riccardi, Chiara;LOSA, MASSIMO;
2016-01-01

Abstract

Reclaimed Asphalt Pavement (RAP) is commonly used to reduce the cost of pavement construction, preserve non-renewable natural resources and reduce the global impact on the environment. Nevertheless, obtaining the properties of the aged and oxidized RAP binder remains challenging. The current extraction and recovery procedure is affected by unclear effects on the binder properties due to the solvent action. Therefore, the implementation of a novel and practical procedure for estimating the properties of RAP binder without altering the material behavior is very much needed. This research effort investigates the possibility of developing a simple analysis method to estimate the high-Temperature properties of RAP binder without extraction or chemical treatments. The proposed procedure makes use of Dynamic Shear Rheometer (DSR) tests on asphalt mortars, composed by fresh binder and RAP material passing sieve #100. The modified Nielsen model and the Voigt model are then used to back-calculate RAP binder properties. Once the master curve of the complex modulus and of the phase angle of the RAP binder are backcalculated from binder and mortars properties, the Superpave parameter G∗/sinδ can be evaluated. Therefore, the amount of RAP binder which is allowed without changing the high temperature performance grade (PG) can be estimated by interpolation. Then, based on blending chart, fresh binder PG corresponding to a specific RAP binder amount can be obtained without exceeding the prescribed permanent deformation threshold. The final procedure developed was verified through DSR tests, and its capability of capturing the high temperature properties of RAP binder was demonstrated.
2016
9789811104497
9789811104497
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/838687
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