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Published in:
2022 | OriginalPaper | Chapter
Multi-scale Evaluation of Asphalt Binders Containing Different Proportions of Reclaimed Asphalt Pavement (RAP)
Authors : K. Lakshmi Roja, Bhaskar Vajipeyajula, Eyad Masad
Published in: Proceedings of the RILEM International Symposium on Bituminous Materials
Publisher: Springer International Publishing
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Abstract
This study aimed to evaluate the nano-mechanical properties of RAP blended binders and investigate their relationship with the bulk (macro-scale) properties. The tests were conducted on asphalt binders with different RAP contents (0, 15, 25, 35, 100% RAP). In the nanoindentation test, a trapezoidal loading waveform was applied using the Berkovich tip. The indentation depths during loading, holding and unloading were analyzed using a linear viscoelastic model. Consequently, the storage and loss viscoelastic moduli were determined and compared with those obtained at the macro-scale using the dynamic shear rheometer. With the addition of RAP content, the macro-scale modulus increased at a faster rate than the nano-scale modulus. The paper recommends an approach for studying the interaction between RAP and virgin binders using the nanoindentation method. This approach is valuable to determine the optimum amount of RAP that can be used in a mixture without adversely affecting its fracture resistance.