## 3 Result and Discussion
### FT-IR Modified Asphalt before and after LTOA  
The performance of crepe rubber and TMQ antioxidants against long-term aging of asphalt can be simulated using the Long Term Oven Aging (LTOA) method [41]. Furthermore, long-term characterization using FTIR analysis in the range of wavenumbers from 4000 to 600 cm\({}^{-1}\). Long-term asphalt aging is indicated by the formation of carbonyl groups (-C=O) at the wave number 1700 cm\({}^{-1}\) and sulfoxide (-S=O) at the wave number 1030-1070 cm\({}^{-1}\)[42; 43]. Figure 12A illustrates the results of FTIR analysis for samples of asphalt pen grade 60/70. asphalt with the addition of 10% crepe rubber (B2 non-TMQ) asphalt with the addition of crepe rubber and 2% TMQ (B2) before aging. The results showed that there were several absorption peaks at several wavelengths including, 3670 cm\({}^{-1}\) (Free OH), 2930 cm\({}^{-1}\) (CH2, CH3), 1600 cm\({}^{-1}\) (C=C), 1455 cm\({}^{-1}\) (CH3 Deformation), 1379 cm\({}^{-1}\) (CH3 Deformation), 1060 cm\({}^{-1}\) (SO or CC aromatic (crepe rubber or TMQ)), 825 cm\({}^{-1}\), 745 cm\({}^{-1}\) (CH aromatic) [44; 45]. The addition of crepe rubber to the asphalt did not chemically affect the asphalt. This was evidenced by the FTIR results graph, which did not find any new clusters. However, with asphalt with crepe rubber and TMQ, there was an increase and decrease in the number of clusters that were not so specific. At wavenumbers 3670 and 1060 cm\({}^{-1}\), there is an increase in the hydroxy group not attached to hydrogen and generally found in the form of alcohol or phenol with the OH group sterically inhibited. It should be noted that the wavenumber 3670 cm\({}^{-1}\) can also indicate free OH groups and free from interaction with ions or other groups [45]. Figure 11: Complex Modulus Before and After Aging (RTFOT). Figure 12: (**A**) FT-IR of asphalt before LTOA. (**B**) FT-IR asphalt after LTOA. While the group at wave number 1060 cm\({}^{-1}\) shows the sulfoxide (S-O) groups of asphalt [42; 43; 44]. Naturally, asphalt has a sulfoxide group because asphalt contains a certain amount of sulfur. Due to storage for a long time, it causes oxidation of the asphalt to form sulfoxide groups. But the addition of crepe rubber and TMQ antioxidants in the asphalt mixture increased the number of groups at the wavenumber of 1060 cm\({}^{-1}\). The increase in these groups was not due to an increase in sulfoxide groups but increased the aromatic C-C group from crepe rubber and TMQ [46]. Figure 12B. It is an illustration of FTIR analysis results for samples of asphalt pen grade 60/70, asphalt with the addition of 10% crepe rubber, and asphalt with the addition of crepe rubber and 2% TMQ after aging. By comparing Figure 12A,B, it is not found to include new groups in the sample, especially the carbonyl group (1700 cm\({}^{-1}\)), indicating aging on the asphalt. The indication of asphalt aging is shown in the increase of sulfoxide groups after the aging process peaked at 1060 cm\({}^{-1}\). However, at the same wavenumber, it can be seen that the sample with the addition of crepe rubber and TMQ has an increasingly steeper peak. The peak that is formed is getting steeper, indicating an increase in the concentration of a group. In this case, the aromatic C-C group's increase played a significant role in the 1060 cm\({}^{-1}\) peak's steepening. The increase in aromatic C-C groups tends to be caused by the degradation of crepe rubber or TMQ during the aging process [46]. Aging of asphalt samples with a mixture of crepe rubber and TMQ showed decreased peak sharpness at wavenumbers 825 cm\({}^{-1}\) and 745 cm\({}^{-1}\) (C-H aromatic). The decrease in peaks of 825 cm\({}^{-1}\) and 745 cm\({}^{-1}\) showed the performance of TMQ, which suppressed carbonyl group formation by changing the aromatic C-H groups, which were the source of radical formation to become aromatic C-C. The increase in the carbonyl group should be directly proportional to the increase in aromatic C-H [47].