Modification Mechanism of Asphalt Modified with Rock Asphalt and Styrene-Butadiene Rubber (SBR)

Table 4

Assignations of the Main Bonds of FT/IR Spectra in the main compounds of asphalt.

Peak items	Main wavenumber (cm^−1)	Vibrations
Saturated hydrocarbon	1475–700, 1375–1380, 1400, 720	C-H, C-C, C-CH3, H-C-H, -CH2-,
Aromatic hydrocarbon	3030, 1600–1500, 1500–1480, 1610–1500, 1650–1600, 1525–1450, 2000–1670	C-H, C=C
Carboxyl compound	1725, 1690, 2820, 2720, 1700–1670, 1690–1600, 3550, 3200–2500, 1700–1680, 920, 1860–1750, 1740, 1700, 1300–1050, 1210–1160	C=O, O-H, C-O-C
Hydroxy compound	2700–2500	-COOH
Nitrogen-containing compound	3050, 1690–1650, 1640–1600, 1400, 1680–1655, 1550–1530, 1300, 620	C-H, C-N, O=C-N
Sulfur-containing compound	2992–2955, 2897–2869, 1090, 2590–2560, 1065–1030, 520–430	S-C, ArSH, S=O, S-S