## 2 Materials and Experimental Method
### Test on Physical Properties  
The rotational viscometer test, performed in accordance with ASTM D4402 [19], was employed to assess the workability of the asphalt binder. This evaluation was conducted at two critical temperatures, 135 \({}^{\circ}\)C and 180 \({}^{\circ}\)C, using a sample size of 10.5 g and a spindle number 27. A total of 20 readings were taken at one-minute intervals to accurately replicate field conditions. Testing at these temperatures is essential for determining the binder's  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Aging States** & **Test Properties** & **Test Result** \\ \hline \multirow{3}{*}{Original binder} & Viscosity @ 135 \({}^{\circ}\)C (cP) & 757 \\  & Viscosity @ 180 C (cP) & 285 \\  & G*/sin \(\delta\) @ 64 \({}^{\circ}\)C (kPa) & 2.06 \\ \hline RTFO-aged residual & G*/sin \(\delta\) @ 64 \({}^{\circ}\)C (kPa) & 5.27 \\ \hline RTFO + PAV- & G*sin \(\delta\) @ 25 \({}^{\circ}\)C (kPa) & 3396 \\ aged residual & Stiffness @ \(-12\) \({}^{\circ}\)C (MPa) & 182 \\  & m-value @ \(-12\) \({}^{\circ}\)C & 0.32 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Properties of primary binder (PG 64-22).  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Properties** & **Test Method** & **Test Result** \\ \hline Penetration (25 \({}^{\circ}\)C) & ASTM D5 [15] & 1–3 \\ \hline Density & ASTM D70 [16] & 1.41–1.43 g/m\({}^{3}\) \\ \hline Softening point & ASTM D36 [17] & 93 \({}^{\circ}\)C–99 \({}^{\circ}\)C \\ \hline Flash point & ASTM D92 [18] & 256 \({}^{\circ}\)C–267 \({}^{\circ}\)C \\ \hline Fire point & ASTM D92 (Cleaveland open cup) [18] & 307 \({}^{\circ}\)C–311 \({}^{\circ}\)C \\ \hline \hline \end{tabular}
\end{table}
Table 2: Properties of Trinidad Lake Asphalt.  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Polymer Attribute** & **Linear Structure** \\ \hline Styrene Content, wt \% & 15 \\ \hline Diblock Content, wt \% & 18 \\ \hline Melt Flow, g/10 min (200 \({}^{\circ}\)C/5 kg) & 11 \\ \hline Solution Viscosity, cps & 1240 \\ \hline Ash Content, wt \% & 0.3 \\ \hline Volatile Matter, wt \% & 0.2 \\ \hline Specific Gravity & 0.92 \\ \hline Tensile Strength, psi (MPa) & 3600 (25) \\ \hline Elongation, \% & 1250 \\ \hline Hardness, Shore A & 33 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Characteristics of SIS polymer.  
viscosity, which is a key factor affecting its handling and application during the mixing and compaction processes in pavement construction.  
The viscosity of the binder at elevated temperatures provides insight into its flow characteristics, which are crucial for ensuring proper mixing with aggregates and achieving optimal compaction in pavement layers. By analyzing the binder's performance at 135 \({}^{\circ}\)C, we gain an understanding of its behavior during typical hot-mix asphalt operations, where this temperature represents the standard mixing and laying conditions. Testing at 180 \({}^{\circ}\)C, on the other hand, allows us to evaluate the binder's performance under more extreme conditions, such as those encountered during long-distance transportation or when using specific additives that may alter its thermal properties. These assessments are vital for ensuring that the asphalt binder maintains its workability, stability, and durability in real-world paving applications.