Problem No$.2$

Using a strain vs$.$ time graph, show the asphalt binder's time$-$dependent visco$-$elastic property. Assume a constant load is applied at time $t_a$; then, the load was removed at time $t_r,$ and the deformations continued to be measured until $t_m$ long after load removal $($hint: refer to section $1\mathrm{.}2\mathrm{.}5$ in your textbook$).$ Provide some explanation.