Use of Fourier Transform Infrared (FT-IR) Spectroscopy to Determine the Type and Quantity of Rejuvenator Used in Asphalt Binder
Recent development in chemical characterization of asphalt binder ascends the scope of using nondestructive techniques to evaluate asphalt binder more rapidly in different laboratory and field condition. Among these techniques, portable Fourier Transform Infrared (FT-IR) Spectroscopy is the most advantageous considering its applicability and efficacy in terms of quick identification and quantification of chemical components in asphalt binder. Previous studies with FT-IR primarily focused on envisaging the chemical alteration in asphalt binder due to the addition of rejuvenator. In this study, FT-IR was used as a primary tool to identify the type and amount of rejuvenator added in asphalt binder. Two types of rejuvenators (bio and aromatic) were used in unmodified, polymer modified and extracted binder from RAP (Reclaimed Asphalt Pavement). Results showed that bio rejuvenator added two distinctive functional groups in asphalt binder at wavenumber 1744 cm−1 (C=O stretching) and 1162 cm−1 (C-O stretching). The amount of bio rejuvenator in asphalt sample can also be determined since C=O and C-O functional groups increased linearly with the increased percentage of added rejuvenator. The R2 values observed for unmodified and modified binders are greater than 0.95 for C=O and C-O respectively, indicating the viability of using FT-IR spectrometer for determining the type and amount of rejuvenator added. It is also observed that bio rejuvenator can be determined in samples containing 20% RAP binder mixed with both unmodified and polymer modified binder while achieving a R2 value of 0.96 (C=O and C-O). On the other hand, aromatic rejuvenator used in this study, did not add any significant functional group in all cases.
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