Reconnecting fractured styrene-butadiene-styrene (SBS) polymer chains and rebalancing unstable colloidal structures of aged pure asphalt using two-component synchronous rejuvenator composite (SRC) are essential for recycling waste SBS-modified asphalt (SBSMA) mixtures. This research develops an efficient approach to identify the optimum dosages of SRC through the restoration of FTIR peak area ratios. Based on the FTIR analysis of aged SBSMA rejuvenated by triallyl isocyanurate (TAIC) (SBS repair agent) and aromatic oil (pure asphalt component regulation agent), the optimum dosage of TAIC was identified at which the FTIR peak area ratio loss at 968 cm-1 was completely compensated by the new peak area ratios at 1022 cm-1 and 1112 cm-1, while the optimum dosage of aromatic oil was defined at which the loss of FTIR peak area ratios at 1376 cm-1 and 1600 cm-1 was fully restored. In line with this principle, seven types of aged SBSMA were prepared and rejuvenated with different dosages of TAIC and aromatic oil incorporated. Through analyzing the FTIR peak area ratios of the prepared aged SBSMAs before and after synchronous rejuvenation, a good linear relationship was found between the optimum TAIC/aromatic oil dosage and the required restoration peak area ratio. The fitting equations of yTAIC=1.7852x+0.0229 (R2= 0.9616) and yAromatic oil=2.2809x-0.0109 (R2 = 0.9395) were developed for determining the optimum dosages of two-component SRC, respectively. After adding the theoretically derived optimum dosages of TAIC and aromatic oil into three aged SBSMAs, their physical-rheological-microscopic performance was found to be restored around 90 % of the virgin ones, validating the efficiency of the newly proposed approach.
Xu, P., Zhang, D., Liu, Z., Tataranni, P., Sangiorgi, C. (2024). An efficient approach to identifying optimum dosages of the two-component synchronous rejuvenator composite for rejuvenating the aged SBS-modified asphalt. POLYMER DEGRADATION AND STABILITY, 231, 1-16 [10.1016/j.polymdegradstab.2024.111088].
An efficient approach to identifying optimum dosages of the two-component synchronous rejuvenator composite for rejuvenating the aged SBS-modified asphalt
Tataranni, Piergiorgio;Sangiorgi, Cesare
2024
Abstract
Reconnecting fractured styrene-butadiene-styrene (SBS) polymer chains and rebalancing unstable colloidal structures of aged pure asphalt using two-component synchronous rejuvenator composite (SRC) are essential for recycling waste SBS-modified asphalt (SBSMA) mixtures. This research develops an efficient approach to identify the optimum dosages of SRC through the restoration of FTIR peak area ratios. Based on the FTIR analysis of aged SBSMA rejuvenated by triallyl isocyanurate (TAIC) (SBS repair agent) and aromatic oil (pure asphalt component regulation agent), the optimum dosage of TAIC was identified at which the FTIR peak area ratio loss at 968 cm-1 was completely compensated by the new peak area ratios at 1022 cm-1 and 1112 cm-1, while the optimum dosage of aromatic oil was defined at which the loss of FTIR peak area ratios at 1376 cm-1 and 1600 cm-1 was fully restored. In line with this principle, seven types of aged SBSMA were prepared and rejuvenated with different dosages of TAIC and aromatic oil incorporated. Through analyzing the FTIR peak area ratios of the prepared aged SBSMAs before and after synchronous rejuvenation, a good linear relationship was found between the optimum TAIC/aromatic oil dosage and the required restoration peak area ratio. The fitting equations of yTAIC=1.7852x+0.0229 (R2= 0.9616) and yAromatic oil=2.2809x-0.0109 (R2 = 0.9395) were developed for determining the optimum dosages of two-component SRC, respectively. After adding the theoretically derived optimum dosages of TAIC and aromatic oil into three aged SBSMAs, their physical-rheological-microscopic performance was found to be restored around 90 % of the virgin ones, validating the efficiency of the newly proposed approach.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
