## 3 Results and Discussion
### Burgers' Model Parameters  
Burgers' model parameters were derived using the procedure presented in Section 2.3. The procedure was the same for creep curves determined in both tests. Results for the TCT are presented in Table 4 and results for the BBCT are presented in Table 5.  
Burgers' model parameters differ in all cases, apart from the \(\eta_{1}\) coefficient of viscosity steady flow, in whose case values are comparable. Secondary parameters E\({}_{2}\) and \(\eta_{2}\) present higher values for the TCT and show better consistency with the results determined from dynamic tests [55]. In the case of the E\({}_{1}\) modulus the situation is more complicated. While the values obtained from the TCT are almost two times lower than those derived from the BBCT and seem more realistic, a reduction in values obtained from the TCT could have been caused to some extent by the less accurate record of the \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{
\begin{tabular}{c} **Mixture** \\ **Designation** \\ \end{tabular} } & \multicolumn{3}{c}{**Test**} & \multicolumn{3}{c}{**Burgers Model Parameters**} \\ \cline{3-6}  & \multicolumn{1}{c}{**Temperature T,**} & \multicolumn{1}{c}{**E\({}_{1}\), MPa**} & \multicolumn{1}{c}{**E\({}_{2}\), MPa**} & \multicolumn{1}{c}{\(\eta_{1}\), MPa-s} & \multicolumn{1}{c}{\(\eta_{2}\), MPa-s} \\ \hline \multirow{4}{*}{AC 11S 70/100} & \(-\)20 & 24,601 & 60,649 & 620,381,505 & 83,584,308 \\  & \(-\)10 & 12,516 & 6790 & 38,457,749 & 14,471,875 \\  & 5 & 2791 & 254 & 991,934 & 767,794 \\  & 20 & \({}^{*}\) & \({}^{*}\) & \({}^{*}\) & \({}^{*}\) \\ \hline \multirow{4}{*}{AC 11S 50/70} & \(-\)20 & 24,656 & 115,183 & 827,458,047 & 90,290,579 \\  & \(-\)10 & 13,737 & 7758 & 69,265,928 & 21,096,067 \\ \cline{1-1}  & 5 & 4070 & 459 & 4,086,935 & 1,888,343 \\ \cline{1-1}  & 20 & 629 & 14 & 353,051 & 62,056 \\ \hline \multirow{4}{*}{AC 11S} & \(-\)30 & 29,941 & 98,166 & 2,381,475,542 & 91,889,789 \\  & \(-\)20 & 19,307 & 19,490 & 195,046,816 & 28,798,508 \\ \cline{1-1}  & \(-\)10 & 12,257 & 4123 & 21,890,814 & 10,897,801 \\ \cline{1-1}  & 5 & 2762 & 239 & 3,205,784 & 1,009,562 \\ \hline \multirow{4}{*}{AC 11W 35/50} & \(-\)20 & 21,772 & 28,228 & 600,059,352 & 75,959,661 \\ \cline{1-1}  & \(-\)10 & 13,004 & 8210 & 87,034,368 & 23,417,485 \\ \cline{1-1}  & 5 & 4031 & 601 & 5,187,255 & 2,240,592 \\ \cline{1-1}  & 20 & 749 & 16 & 453,536 & 85,500 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Burgers’ model parameters for the Tensile Creep Test (TCT) \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{
\begin{tabular}{c} **Mixture** \\ **Designation** \\ \end{tabular} } & \multicolumn{3}{c}{**Test**} & \multicolumn{3}{c}{**Burgers’ Model Parameters**} \\ \cline{3-6}  & \multicolumn{1}{c}{**Temperature T,**} & \multicolumn{1}{c}{**E\({}_{1}\), MPa**} & \multicolumn{1}{c}{**E\({}_{2}\), MPa**} & \multicolumn{1}{c}{\(\eta_{1}\), MPa-s} & \multicolumn{1}{c}{\(\eta_{2}\), MPa-s} \\ \hline \multirow{4}{*}{AC 11S 70/100} & \(-\)20 & 38,503 & 4,517 & 588,962,264 & 2,007,996 \\  & \(-\)10 & 34,090 & 2,948 & 60,779,274 & 624,963 \\ \cline{1-1}  & 0 & 18,572 & 801 & 3,152,349 & 271,364 \\ \cline{1-1}  & 10 & 6,168 & 151 & 397,640 & 41,598 \\ \hline \multirow{4}{*}{AC 11S 50/70} & \(-\)20 & 46,106 & 5,024 & 595,720,702 & 470,341 \\  & \(-\)10 & 34,208 & 3,350 & 79,945,328 & 490,828 \\ \cline{1-1}  & 0 & 18,582 & 1,153 & 5,340,236 & 303,322 \\ \cline{1-1}  & 10 & 5,129 & 175 & 467,638 & 49,697 \\ \hline \multirow{4}{*}{AC 11S} & \(-\)20 & 45,953 & 4,676 & 487,685,841 & 588,195 \\ \cline{1-1}  & \(-\)10 & 30,444 & 3,149 & 53,177,748 & 437,444 \\ \cline{1-1}  & 0 & 17,695 & 876 & 3,849,752 & 319,700 \\ \cline{1-1}  & 10 & 5,134 & 167 & 478,026 & 47,128 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: [PERSON] model parameters for the Bending Beam Creep Test (BBCT). creep curve in the unloading part.